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ExtremaRatio - 185° RAO knife - PRIVATE COLLECTION - Knife
PREVIOUSLY PURCHASED KNIFE, PRIVATE COLLECTION
* Origin: acquired from private owner - SERIAL CK0191S - produced in 2021
* Condition: overall very good condition (see photos)
* Market availability: no longer in production in this unit-marked version
* Sharpening: factory edge
* Blade marks: none
* Handle marks: none
* Box: present, slightly damaged
* Sheath: included
* Manuals, certificates and warranty: included
* Checked and certified by our internal laboratory
Folding knife made according to specifications requested by the Italian Army unit 185th RAO (Regiment for Target Acquisition) and currently in service with the same unit. The service version differs from the civilian one only by the complete absence of writings or logos on the blade.
HISTORICAL NOTES ON THE UNIT:
The 185th RAO of the "Folgore" is a unit with ancient traditions, yet relatively new in its current form. It was established on 3 April 2000 following the reorganization of the 185th Paratroopers Artillery Regiment. Based in Livorno, it is an atypical artillery unit currently included within the Special Forces framework.
Composed entirely of volunteer personnel, the 185th RAO selects its members through physical tests and a qualification course structured in modules of increasing difficulty. The tasks assigned to RAO operators are numerous and highly sensitive: they involve gathering information on enemy targets and relaying it to command. More generally, this can be described as reconnaissance in sensitive areas.
"It is therefore clear," the Army emphasizes, "that the activity of the acquisition operator takes place mainly in hostile territory, in small self-sufficient teams operating in isolation."
RAO paratroopers are specialists in infiltration and exfiltration techniques and are able to operate in the field for up to 8–10 days without external resupply. They know how to avoid capture, escape and evade from enemy-controlled areas and, above all, how to identify, define and assess strategically relevant targets. Since 2002, the year of its reorganization, detachments of the 185th Regiment have operated in all major operational theaters: from the Balkans to Afghanistan and Iraq. In these areas they mainly carry out medium- and long-range reconnaissance and surveillance activities within the area of responsibility of the Italian contingent.
Intended use: military/tactical
Type of production: industrial
Blade production: Italy
Blade: N690Co stainless steel 58/60HRC
Blade treatment: MIL-C 13924 black coating
Handle: anodized anticorodal aluminum 4.5mm
Blade length: 118mm
Blade thickness: 6.3mm
Closed length: 142mm
Total length: 261mm
Weight: 335g
Lock: modified front lock with additional threaded safety pin
Clip: none
Sheath: tactical nylon MOLLE-compatible, suitable for both closed and open knife use
Notes: diamond pocket sharpener includedER-RAO-BK-CP -
ExtremaRatio - Folgore Verticale - Black M390 Limited Edition – Military Fixed Blade Compact Knife
A compact fixed-blade knife designed for high-intensity operational use, where weight, size, and reliability are critical factors. The FOLGORE VERTICALE builds on the experience of the FOLGORE Nitrogen model, evolving its design into an even more streamlined and high-performance version.
The 61 HRC Böhler M390 steel blade offers high wear resistance, edge retention, and consistent performance even under harsh conditions. The blued finish reduces glare, optimizing its use in tactical environments. The tip geometry and balance are designed to ensure precision, control, and rapid execution.
The design prioritizes weight reduction and ergonomic efficiency, allowing for extended carry without fatigue and immediate use in any operational context.
Supplied with a thermoformed Kydex sheath featuring a modular platform compatible with multiple configurations.
Limited edition of only 300 numbered pieces, intended for collectors and professional users.
Intended use: Collectible / Utility / Tactical
Production type: Industrial
Country of manufacture: Italy
Blade: hidden tang in Bohler M390 stainless steel, 61 HRC
Blade finish: MIL-C-13924 burnishing
Handle: removable, in Forprene
Blade length: 128 mm.
Blade thickness: 4.8 mm.
Overall length: 242 mm.
Weight: 164 g.
Sheath: Kydex, thermoformed, with a modular platform compatible with multiple configurations
Packaging: Cardboard box with Extrema Ratio logos
Notes: Numbered and limited edition of only 300 piecesER-FOLV-LE -
ExtremaRatio - Folgore - Nitrogen Stonewashed & Black Forprene - Military Fixed Blade Compact Knife
A compact fixed-blade knife designed for continuous operational use, where compact size, structural strength, and reliability are primary requirements. FOLGORE Nitrogen is the result of a joint development with the “Folgore” Parachute Brigade and validation through field testing in real-world scenarios.
The Nitrogen steel blade combines corrosion resistance, edge retention, and mechanical strength, while maintaining a slim profile to optimize weight and portability. The tapered tip geometry allows for precision and control during technical operations, ensuring an immediate and reliable response.
The handle is designed to maximize ergonomics and grip, ensuring control even in dynamic conditions and during prolonged use. The overall balance promotes maneuverability and speed of use without compromising sturdiness.
Designed for direct integration into gear, the FOLGORE Nitrogen is configured for discreet and continuous carry, minimizing bulk without sacrificing functionality thanks to the thermoformed Kydex sheath with a modular platform compatible with multiple configurations.
Intended Use: Multi-purpose / Utility / TacticalProduction Type: Industrial
Country of Manufacture: Italy
Blade: Hidden tang in Nitrogen nitrogen-alloy steel
Blade Finish: Stonewashed
Handle: Removable, Forprene
Blade Length: 128mm.
Blade thickness: 4.8 mm.
Overall length: 242 mm.
Weight: 164 g.
Sheath: Kydex, thermoformed, with a modular platform compatible with multiple configurations
Packaging: Cardboard box with Extrema Ratio / Army / Folgore logos
Notes: Product manufactured under official licenses from the Italian ArmyER-FOLN -
ExtremaRatio - F.O.K. Nitrogen Outdoor - FOK Compact Knife - Knife
The F.O.K. Nitrogen Outdoor is a fixed blade knife designed for outdoor use, balancing low weight (164 g) with the structural strength of Nitrogen steel. The 4.8 mm thick blade with a flat grind profile is suitable for carving, firewood preparation, working with natural materials, and precision cuts.
The stone washed finish enhances abrasion resistance and simplifies maintenance in outdoor environments. The ergonomic Forprene handle scales offer a secure grip even with wet or dirty hands, ideal for bushcraft, trekking, and advanced camping activities.
The modular carrying system with MOLLE-compatible Kydex sheath and multiple clip systems makes it easy to integrate the knife into technical gear, backpacks, or belts.
This model is positioned in the advanced outdoor category, offering reliable field performance without unnecessary technical overload.
Intended use: Professional outdoor, bushcraft, and advanced outdoor activities
Production type: Industrial, Italian production by Extrema Ratio
Country of origin: Italy
Blade: Full tang Nitrogen steel – high nitrogen content steel optimized for strength and corrosion resistance
Blade finish: Stone washed
Blade grind: Flat edge for versatile outdoor cutting tasks
Handle: Monolithic Forprene with green ergonomic scales – non-slip grip even with wet or dirty hands
Blade length: 128 mm
Blade thickness: 4.8 mm
Overall length: 242 mm
Weight: 164 g
Sheath: Lightweight, durable Kydex – water-resistant and maintenance-free
Packaging: Box with Extrema Ratio branding
Note: High-visibility orange paracord included – easy to locate on difficult terrainER-FOK -
ExtremaRatio - Requiem - Stonewashed M390 & Black Forprene - tactical knife
Extrema Ratio Requiem M390 is an extremely compact, lightweight and effective tactical knife designed for professional use in real-world operational settings. Weighing only 93 grams, it can be used both as a main blade and as a reliable backup knife.
The blade is made of Böhler M390 steel, heat-treated to 61 HRC. Thanks to a powder metallurgical process, this material ensures high cutting efficiency, excellent wear resistance and remarkable protection from oxidation. The profile is spear point type, with a fuller fuller that further lightens the blade and a false counterbore extended three-quarters of the length. The flat edge sharpening ensures precise and efficient cuts.
The forprene handle, featuring Extrema Ratio's classic ergonomic recesses, ensures a firm grip even under extreme operating conditions.
Requiem M390 comes with an ASPIS hard scabbard, compatible with the M.O.L.L.E. The two adjustable loops allow for secure and customizable installation. The tapered invitation design facilitates blade reinsertion, while the trigger safety allows for quick and instinctive drawing with a simple press.
Intended Use: Tactical/Multi-roleProduction Type: Industrial
Country of manufacture: Italy
Blade: M390 stainless steel hardened to 61HRC
Blade treatment: Stonewashed
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 93g.
Sheath: Nylon ASPIS with two multi-position clips, M.O.L.L.E. compatible.
Packaging: cardboard box with Extrema Ratio logos.
Notes: -ER-REQ-M390SW -
ExtremaRatio - Requiem - Black M390 & HCS Forprene - tactical knife
Extrema Ratio Requiem M390 is an extremely compact, lightweight and effective tactical knife designed for professional use in real-world operational settings. Weighing only 93 grams, it can be used both as a main blade and as a reliable backup knife.
The blade is made of Böhler M390 steel, heat-treated to 61 HRC. Thanks to a powder metallurgical process, this material ensures high cutting efficiency, excellent wear resistance and remarkable protection from oxidation. The profile is spear point type, with a fuller fuller that further lightens the blade and a false counterbore extended three-quarters of the length. The flat edge sharpening ensures precise and efficient cuts.
The forprene handle, featuring Extrema Ratio's classic ergonomic recesses, ensures a firm grip even under extreme operating conditions.
Requiem M390 comes with an ASPIS hard scabbard, compatible with the M.O.L.L.E. The two adjustable loops allow for secure and customizable installation. The tapered invitation design facilitates blade reinsertion, while the trigger safety allows for quick and instinctive drawing with a simple press.
Intended Use: Tactical/Multi-role
Production Type: Industrial
Country of manufacture: Italy
Blade: M390 stainless steel hardened to 61HRC
Blade treatment: Burnishing MIL-C-13924
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 93g.
Sheath: Nylon ASPIS with two multi-position clips, M.O.L.L.E. compatible.
Packaging: cardboard box with Extrema Ratio logos.
Notes: -ER-REQ-M390H -
ExtremaRatio - Misericordia Desert - single edge fixed blade knife - Made in Italy
Extrema Ratio Misericordia Desert, which preserves intact all the features of the famous Misericordia model adopted by the 4th Alpine Parachute Regiment, derives from the commemorative dagger made on the occasion of the 140th anniversary of the 4th Alpine Regiment and the 70th since the founding of the Alpine Paratroopers.
It is a tactical-type fixed-blade knife designed for those instances when the knife must be extremely light and compact. The new desert coloring also makes this model available in a shade in line with the most common needs of modern operational departments.
The blade is milled from Böhler N690 steel, hardened to 58 HRC for the best balance of edge retention and strength, is 118 mm long, 4mm thick, and has a flat edge. The weight of the knife is just 87g. The profile is a spear point type, with a full-length shank that makes it even lighter and with a ¾-length false counterblade. The finish is a stone washed type.
The knife's polymer handle features classic Extrema Ratio shells that make for a more secure grip and is attached to the tang by a through-screw. On the rear end the handle flows connecting with a wide ring equipped with a "skull crusher" appendage: a ring that allows the use of martial arts techniques and ensures the hand a very solid grip. In this version the handle is in Desert coloring.
Since this is a knife designed for professional use, much attention has been paid to ease of carrying, accessibility and extraction in case of need. The knife is secured to the sheath by a quick-release safety that can be easily reversed for left-handed use. The sheath is also in Desert coloring, made of high-strength Nylon, very versatile and equipped with 2 adjustable loops that allow it to be attached to M.O.L.L.E systems, facilitating quick extraction in various tactical scenarios.
Intended Use: Tactical / Multirole
Production Type: Industrial
Country of Production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Stonewashed
Handle: FRN (fiberglass reinforced nylon)
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 233mm.
Weight: 87g.
Sheath: Nylon with two multi-position clips, designed for M.O.L.L.E. type attachments.
Packaging: cardboard box with Extrema Ratio logos
Notes: Rear Skull Crasher - Derived from the Black model, adopted by the 4th Alpine Parachute Regiment.ER-MIS-DE -
ExtremaRatio - Misericordia - 4th Alpine Paratroopers Regiment - tactical knife
The Extrema Ratio Misericordia was adopted by the 4th Alpine Paratroopers Regiment which helped develop and test the product. It is a tactical fixed blade knife, extremely light and compact, it can be used both as a main knife or as a backup blade.
The blade is made of Böhler N690 steel, heat-treated to a hardness of 58 HRc, it is 118 mm long, 4mm thick and has a flat edge.
The profile is of the spear point type, with a full length fuller which makes the blade even lighter and with a false counter-thread at ¾ length. The blade is available with the classic Extrema Ratio MIL-C-13924 black finish.
The handle in fiberglass-reinforced nylon (FRN) features the classic Extrema Ratio recesses that make the grip safer and is fixed to the tang by means of a through screw.
On the rear end the handle flows connecting with a large ring, which allows the use of martial arts techniques and ensures a very solid grip to the hand, equipped with a "skull crusher" appendix in hard metal.
The overall weight of the knife is just 87g. Being a knife designed for professional use, much attention has been paid to ease of port, accessibility and extraction in case of need. The knife is secured to the sheath by a quick-release safety catch that can be easily reversed for use by left-handers.
The sheath is made of highly resistant Nylon, it is very versatile and two adjustable loops allow it to be fixed inside the loops of M.O.L.L.E.
The sheath is equipped with a conical invitation to facilitate the re-insertion of the knife while a simple pressure on the trigger safety allows it to be extracted quickly and instinctively.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: in N690Co stainless steel hardened to 58HRC
Blade treatment: MIL-C-13924 burnishing
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 233mm.
Weight: 87g.
Sheath: in Nylon with two multi-position clips, designed for M.O.L.L.E.
Packaging: Cardboard box with Extrema Ratio logos
Notes: Rear Skull Crasher - Adopted by the 4th Alpine Paratroopers Regiment.ER-MIS-BK -
ExtremaRatio - BF4 Lucky Black - knife
Intended use: Tactical
Type of production: Industrial
Lama production: Italy
Blade: Stainless steel N690Co 58HRC
Lama treatment: Testudo
Handle: Anticorodal
Blade length: 122mm.
Blade thickness: 3mm.
Length closed: 150mm.
Total length: 277mm.
Thick when closed: 17mm.
Balancing: -
Weight: 137g.
Closure: Liner Lock
Clip: removable in stainless steel
Sheath: -
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-BD4-BK -
ExtremaRatio - BD4 Lucky Desert - knife
Intended use: Tactical
Type of production: Industrial
Lama production: Italy
Blade: Stainless steel N690Co 58HRC
Lama treatment: Satin
Handle: Anticorodal
Blade length: 122mm.
Blade thickness: 3mm.
Length closed: 150mm.
Total length: 277mm.
Thick when closed: 17mm.
Balancing: -
Weight: 137g.
Closure: Liner Lock
Clip: removable in stainless steel
Sheath: -
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-BD4-DE -
ExtremaRatio - Requiem Black - tactical knife
Multi-purpose tactical knife with a light weight and very well-grip. The stiletto type blade is sharpened only on one side and has a guard. The Requiem is equipped with the innovative nylon liner Aspis expressly studied by Extrema Ratio to allow the quick release of the blade and the fixing inside the passages of the M.O.L.L.E system, thanks to two multiposition clips.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Burnishing MIL-C-13924
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 86g.
Sheath: Nylon with two multiposition clips, designed for M.O.L.L.E.
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-REQ-BK -
ExtremaRatio - Requiem HCS - tactical knife
Multi-purpose tactical knife with a light weight and very well-grip. The stiletto type blade is sharpened only on one side and has a guard. The Requiem is equipped with the innovative nylon liner Aspis expressly studied by Extrema Ratio to allow the quick release of the blade and the fixing inside the passages of the M.O.L.L.E system, thanks to two multiposition clips.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Satin
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 86g.
Sheath: Nylon with two multiposition clips, designed for M.O.L.L.E.
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-REQ-HC -
ExtremaRatio - Requiem Desert - tactical knife
Multi-purpose tactical knife with a light weight and very well-grip. The stiletto type blade is sharpened only on one side and has a guard. The Requiem is equipped with the innovative nylon liner Aspis expressly studied by Extrema Ratio to allow the quick release of the blade and the fixing inside the passages of the M.O.L.L.E system, thanks to two multiposition clips.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Satin
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 86g.
Sheath: Nylon with two multiposition clips, designed for M.O.L.L.E.
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-REQ-DE -
ExtremaRatio - Requiem Ranger Green - tactical knife
Multi-purpose tactical knife with a light weight and very well-grip. The stiletto type blade is sharpened only on one side and has a guard. The Requiem is equipped with the innovative nylon liner Aspis expressly studied by Extrema Ratio to allow the quick release of the blade and the fixing inside the passages of the M.O.L.L.E system, thanks to two multiposition clips.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Satin
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 86g.
Sheath: Nylon with two multiposition clips, designed for M.O.L.L.E.
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-REQ-RG -
ExtremaRatio - Requiem Wolf Gray - tactical knife
Multi-purpose tactical knife with a light weight and very well-grip. The stiletto type blade is sharpened only on one side and has a guard. The Requiem is equipped with the innovative nylon liner Aspis expressly studied by Extrema Ratio to allow the quick release of the blade and the fixing inside the passages of the M.O.L.L.E system, thanks to two multiposition clips.
Intended use: Tactical / Multirole
Type of production: Industrial
Country of production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Satin
Handle: Forprene
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 238mm.
Weight: 86g.
Sheath: Nylon with two multiposition clips, designed for M.O.L.L.E.
Packaging: cardboard box with Extrema Ratio logos
Note: -ER-REQ-WG -
ExtremaRatio - Mamba Wolf Gray - tactical knife
A compact and compact multi-role knife with ABS fast release sheath with two multiposition clips and tight enough to be secured inside the passers-through of the M.O.L.L.E. - Available in four color variants: Black, Desert, Ranger Green and HCS (Hybrid Coyote Sage)
Intended use: tactical / multi role
Type of production: industrial
Country of production: Italy
Blade: N690Co stainless steel hardened to 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 116mm.
Blade thickness: 4mm.
Total Length: 237mm.
Weight: 85g.
Sheath: in ABS with two multiposition clips, designed for type M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos
Notes: -ER-MAM-WG -
ExtremaRatio - Mamba Black - tactical knife
A compact and compact multi-role knife with ABS fast release sheath with two multiposition clips and tight enough to be secured inside the passers-through of the M.O.L.L.E. - Available in four color variants: Black, Desert, Ranger Green and HCS (Hybrid Coyote Sage)
Intended use: tactical / multi role
Type of production: industrial
Country of production: Italy
Blade: N690Co stainless steel hardened to 58HRC
Blade Treatment: MIL-C-13924 PVD
Handle: Forprene
Blade Length: 116mm.
Blade thickness: 4mm.
Total Length: 237mm.
Weight: 85g.
Sheath: in ABS with two multiposition clips, designed for type M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos
Notes: -ER-MAM-BK -
ExtremaRatio - Mamba Ranger Green - tactical knife
A compact and compact multi-role knife with ABS fast release sheath with two multiposition clips and tight enough to be secured inside the passers-through of the M.O.L.L.E. - Available in four color variants: Black, Desert, Ranger Green and HCS (Hybrid Coyote Sage)
Intended use: tactical / multi role
Type of production: industrial
Country of production: Italy
Blade: N690Co stainless steel hardened to 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 116mm.
Blade thickness: 4mm.
Total Length: 237mm.
Weight: 85g.
Sheath: in ABS with two multiposition clips, designed for type M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos
Notes: -ER-MAM-RG -
ExtremaRatio - Mamba HCS - tactical knife
A compact and compact multi-role knife with ABS fast release sheath with two multiposition clips and tight enough to be secured inside the passers-through of the M.O.L.L.E. - Available in four color variants: Black, Desert, Ranger Green and HCS (Hybrid Coyote Sage)
Intended use: tactical / multi role
Type of production: industrial
Country of production: Italy
Blade: N690Co stainless steel hardened to 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 116mm.
Blade thickness: 4mm.
Total Length: 237mm.
Weight: 85g.
Sheath: in ABS with two multiposition clips, designed for type M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos
Notes: -ER-MAM-HC -
ExtremaRatio - Mamba Desert - tactical knife
A compact and compact multi-role knife with ABS fast release sheath with two multiposition clips and tight enough to be secured inside the passers-through of the M.O.L.L.E. - Available in four color variants: Black, Desert, Ranger Green and HCS (Hybrid Coyote Sage)
Intended use: tactical / multi role
Type of production: industrial
Country of production: Italy
Blade: N690Co stainless steel hardened to 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 116mm.
Blade thickness: 4mm.
Total Length: 237mm.
Weight: 85g.
Sheath: in ABS with two multiposition clips, designed for type M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos
Notes: -ER-MAM-DE -
ExtremaRatio - Resolza Testudo - knife pattada
Use: Sports
Type of production: industrial
Blade: Stainless steel 58HRC N690Co
Production Blade: Italy
Handle: Anticorodal
Blade length: 122mm.
Blade Thickness: 3mm.
Closed Length: -mm.
Overall length: 268mm.
Balancing: -
Weight: 93g.
Lock: Liner Lock
Clip: -
Sheath: -
Notes: -ER-RE12-BK -
ExtremaRatio - 185° RAO - 2018 Version - heavy folding knife
New version 2018 with improved grip: uses the same handle as the RAO II model
Folding knife made to specific requests of the Italian Army department 185 ° RAO (Regiment Acquisition Objectives) and currently supplied to the homonymous department. The supplied knife differs from the civil one only because of the total lack of writing or logos on the blade.
HISTORICAL SUMS ON THE DEPARTMENT:
The 185 ° RAO of the '' Folgore '' is a department with an ancient tradition, but very new. In fact, it was born on April 3, 2000 following the reconfiguration of the 185th terrestrial paratroop artillery regiment. Based in Livorno, it is an atypical department of the artillery weapon, currently inserted in the Special Forces basin.Entirely composed of voluntary personnel, the 185th RAO selects its components through the passing of a physical test and a qualification course on modules '' with increasing difficulty ''. The tasks entrusted to the RAO's men are many, but all very delicate: it is about gathering information on enemy objectives and 'passing them' to one's command. More generally, it can talk about '' recognition in sensitive areas ''. '' It is therefore evident - they stress to the Army - that the activity of the acquirer takes place mainly in hostile territory, in small self-sufficient nuclei that act in isolation ''.
RAO paratroopers are specialists in '' infiltration and exfiltration '' techniques and are able to move in the operating area '' for up to 8-10 days without external supplies ''. They know how to 'escape from capture, escape and escape from an' enemy controlled area '' and, above all, as '' identify, determine and evaluate objectives '' of strategic interest. Since 2002, the year of reconfiguration, the 185th Regiment detachments have operated in all the hottest operational theaters: from the Balkans to Afghanistan, to Iraq. Here they mainly carry out surveys for medium and long-range information purposes and for monitoring the area of responsibility of the Italian contingent.
Destination of use: military / tactical
Type of production: industrial
Lama production: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: burnishing MIL-C 13924
Handle: 4.5mm anticorodal aluminum anodized
Blade length: 118mm.
Blade thickness: 6.3mm.
Length closed: 142mm.
Total length: 261mm.
Weight: 335g.
Closure: modified front lock with additional threaded security pin
Clip: absent
Sheath: tactical Nylon compatible M.O.L.L.E. suitable both for the closed and open knife
Notes: diamond pocket sharpener includedER-RAO-BK -
ExtremaRatio - BFK Zero Folgore - Stonewashed N690Co & Black Anticorodal - knife
The BFK Zero FOLGORE is an operational EDC project developed in collaboration with the “Folgore” Parachute Brigade, designed for continuous professional use where there is no room for error and every component must perform predictably.
The 3mm N690Co stainless steel blade is engineered to offer a true balance between edge retention, durability, and control, without unnecessary extremes. It features a geometry geared toward intensive daily use, designed to perform rather than be preserved. The construction combines an aluminum handle with steel liners, creating a rigid frame with tight tolerances and consistent mechanical response even under stress.
The Crossbar Lock system ensures safety and reliability at every stage of operation, while maintaining fully ambidextrous handling. Internal bearings ensure a smooth, repeatable opening action, free of jamming, designed to feel natural even without active attention.
The ergonomics are designed for extended carry: the compact profile reduces bulk without compromising the grip, while the ambidextrous clip allows for discreet and customizable carry. The weight remains low for the category, with a balanced distribution that does not feel fragile.
The BFK Zero FOLGORE is a military folding knife conceived as a professional everyday carry tool. It is not designed to be displayed, but to be used. Compact, reliable, efficient
Intended use: Tactical / EDC
Production type: Industrial
Country of manufacture: Italy
Blade: N690Co stainless steel
Blade finish: Stonewashed with Folgore engraving
Handle: Anticorodal aluminum alloy
Blade length: 71mm.
Blade thickness: 2.5 mm.
Closed length: 99 mm.
Overall length: 166 mm.
Weight: 84 g.
Closure: Crossbar Lock
Clip: stainless steel, deep pocket style; reversible, removable, with custom engravings
Notes: Product manufactured under official licenses from the Italian ArmyER-BFK-ZEROF -
ExtremaRatio - BFK EVO - The Carry Box - 500pcs Limited Edition - folding knife
LIMITED EDITION CARRY BOX
– BFK EVO Limited Edition
The BFK EVO is a compact folding knife designed as Extrema Ratio's flagship product for the EDC world. Produced in a limited series of 500 pieces, it is available exclusively in THE CARRY BOX. Extrema Ratio's build quality is evident in every detail: mechanical precision, selected materials, proven ergonomics, ease of handling, concealability, quick opening, and the proverbial reliability that has distinguished the brand for over 30 years. From the very first glance, it conveys a feeling of uncompromising strength and solidity.Main features:
* Nitrogen steel blade with Tanto profile and reinforced tip, stone-washed finish.
* Black anodized aluminum scales, sturdy and compact for easy everyday carry.
* Crossbar lock for exceptional safety.
* Bearing system that guarantees quick, smooth, and natural opening.
* Customized lanyard on the tang for immediate extraction and improved grip.
* Dedicated laser engraving on the blade and clip that identifies the limited series.BFK EVO is not an object to be shown off: it is a tool designed to be carried every day.
Intended use: EDC / Sports
Type of production: industrial
Country of production: Italy
Blade: Nitrogen stainless steel
Blade finish: Stonewashed with custom engravings
Handle: Anticorodal aluminum alloy
Blade length: 71mm.
Blade thickness: 2.5mm.
Closed length: 99mm.
Total length: 166mm.
Weight: 84g.
Locking Mechanism: Crossbar Lock
Clip: stainless steel, deep pocket type; reversible, removable, with custom engravings
Notes: Limited edition, numbered to only 500 pieces worldwide - Knife available for purchase only on this occasion and together with the Carry Box– Extrema Ratio Essential Cap
Baseball cap with an elegant, urban design. Made of sturdy, breathable fabric, it features a silicone patch with the Extrema Ratio logo, an instantly recognizable symbol of belonging.– Leather Zip Wallet
Black leather wallet with three-sided zipper closure and lanyard hook, ideal for preventing accidental loss. Designed to hold everything you need (cards, bills, etc.), it is a durable and reliable accessory, perfect for everyday use.– Carbon Fiber Card
Compact carbon fiber tool with a sharp lower edge, useful in emergency or self-defense situations. It is the size of a credit card and fits into the Extrema Ratio wallet. A side recess facilitates proper grip for maximum effectiveness.ER-CARRYB -
ExtremaRatio - Requiem Evo Dark - 250pcs Limited Edition - CPM-MagnaCut & Black G10 - tactical knife
NEW STRUCTURE: Full Tang
NEW STEEL: CPM-MagnaCut
NEW HANDLES: Black G10
SAME EXTREMA RATIO QUALITY IN ONLY 250 PIECES* Professional when needed. Unconventional when required.
* Only 250 pieces. No replicas. No hesitation.
* Those who own it join an exclusive group.
* Those who use it know what it means to trust their tool.
* Born from the rigors of the operational world. Evolved to dominate unpredictability.REQUIEM EVO DARK is the full tang version of the famous Requiem, enhanced in every aspect: more robust structure, new spear point profile for superior penetration and clean cuts, black G10 scales with a futuristic design.
CPM-MagnaCut steel, the ultimate evolution in materials for real-world tools: durable, sharp, and tough even under stress. A compact, relentless knife, perfect for both the operational theater and the urban environment.
Two contexts. Two sheaths:
* Aspis (EDC Ready): Safe transport, quick draw, concealability.
Compatible with M.O.L.L.E. systems, it is perfect for everyday use, prepping, or urban adventure.
* Kydex (Tactical Setup): Designed for the MOLLE system, it easily adapts to Ulticlip, Belt Clip, Paracord, and alternative configurations.Intended use: Tactical / Multipurpose
Type of production: Industrial
Country of production: Italy
Blade: full tang in CPM-MagnaCut steel
Blade treatment: Anti-reflective burnishing with engravings
Handle: Black G10 with CNC machining
Blade length: 116mm.
Blade thickness: 4mm.
Total length: 237mm.
Weight: 135g.
Sheath: ASPIS nylon with two multi-position clips, M.O.L.L.E. compatible + thermoformed Kydex
Packaging: Cardboard box with Extrema Ratio logos and Limited Edition plaque with progressive knife numbering
Notes: Limited edition, numbered to only 250 pieces worldwideER-REQ-EVOD -
ExtremaRatio - Misericordia Ranger - XXV Anniversarium Limited Edition - knife
Extrema Ratio Misericordia Ranger XXV Anniversarium Limited Edition is a limited series version of only 400 pieces that preserves intact all the features of the famous Misericordia model adopted by the 4th Alpine Parachute Regiment.
Misericordia Ranger XXV Anniversarium Limited Edition comes with 2 sheaths, both in desert color: the first, produced in kydex, offers the possibility of attachment via belt-clip, ulti-clip and malice-clip (optional accessories not included with the product). Attachment to the M.O.L.L.E. system by braiding the paracord is also possible. The second, made of high-strength Nylon, has 2 adjustable loops that allow it to be attached to M.O.L.L.E. systems.
Intended Use: Tactical/Multi-role
Production type: Industrial
Country of Production: Italy
Blade: stainless steel N690Co hardened to 58HRC
Blade treatment: Geotech Camo (Black Warfare)
Handle: FRN (fiberglass reinforced Nylon) with skull crasher / rear glass breaker
Blade length: 118mm.
Blade thickness: 4mm.
Total length: 233mm.
Weight: 87g.
Sheath: double sheath: Kydex and ABS.
Packaging: polypropylene case with Misericordia / Extrema Ratio logos and commemorative Coin
Notes: Limited edition of only 400 pieces, numbered on box and blade to celebrate the company's 25th anniversaryER-MIS-RALE -
ExtremaRatio - BF3 knife - Dark Talon - Afghanistan Edition - PRIVATE COLLECTION - knife
KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously Purchased - Limited Edition supplied by Extrema Ratio for Task Force 45 (TF-45) joint military unit of Italian special forces, operating in Afghanistan from at least June 2006 to 2016, as part of Operation "Sarissa" of the International Security Assistance Force (ISAF).
* Conditions: Like new
* Commercially available No in the version with engraving -
* Sharpening: Original
* Marks on blade: NO
* Signs on handle: NO
* Packaging: YES
* Sheath: -
* Manuals, Certificates and Guarantees: YES
* Checked and Certified by our internal laboratoryIntended use: Sport / Tactical
Type of production: Industrial
Blade production: Italy
Blade: N690Co 58HRC stainless steel
Blade treatment: Testudo
Handle: Anticorodal
Blade length: 125mm.
Blade thickness: 3mm.
Closed length: 150mm.
Total length: 270mm.
Closed thickness: 17mm.
Balancing: -
Weight: 120g.
Closure: Liner Lock
Clip: removable in stainless steel
Scabbard: -
Packaging: cardboard box with Extrema Ratio logos
Note: -AP-ER-BF3-A -
ExtremaRatio - Defender 2 DG Black - Knife
Combat version of the Scout model with ultra-slim shape. The 118 mm blade is lightened in its structure by the bloodstream. It is produced in two versions: with single guard and upper grip or, in the DG version, with double guard for a safer grip in the bushes. It comes with black Kydex sheath with attachment to the M.O.L.L.E. system.
Intended use: Tactical
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade treatment: MIL-C-13924 grinding
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Overall length: 232mm.
Weight: 146g.
Sheath: In Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logosER-DEF2DG-BK -
ExtremaRatio - Defender 2 Black - Knife
Combat version of the Scout model with ultra-slim shape. The 118 mm blade is lightened in its structure by the bloodstream. It is produced in two versions: with single guard and upper grip or, in the DG version, with double guard for a safer grip in the bushes. It comes with black Kydex sheath with attachment to the M.O.L.L.E. system.
Intended use: Tactical
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade treatment: MIL-C-13924 grinding
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Overall length: 232mm.
Weight: 140g.
Sheath: In Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logosER-DEF2-BK -
ExtremaRatio - Defender 2 DG Stone Washed - Knife
Combat version of the Scout model with ultra-slim shape. The 118 mm blade is lightened in its structure by the bloodstream. It is produced in two versions: with single guard and upper grip or, in the DG version, with double guard for a safer grip in the bushes. It comes with black Kydex sheath with attachment to the M.O.L.L.E. system.
Intended use: Tactical
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Overall length: 232mm.
Weight: 146g.
Sheath: In Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logosER-DEF2DGSW -
ExtremaRatio - Defender 2 Stone Washed - Knife
Combat version of the Scout model with ultra-slim shape. The 118 mm blade is lightened in its structure by the bloodstream. It is produced in two versions: with single guard and upper grip or, in the DG version, with double guard for a safer grip in the bushes. It comes with black Kydex sheath with attachment to the M.O.L.L.E. system.
Intended use: Tactical
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Overall length: 232mm.
Weight: 140g.
Sheath: In Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logosER-DEF2-SW -
ExtremaRatio - Scout 2 Satin - knife
Intended use: Hiking / Backup
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade Treatment: Satin
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Total Length: 232mm.
Weight: 145g.
Sheath: Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos12659 -
ExtremaRatio - Scout 2 Black - knife
Intended use: Hiking / Backup
Type of production: Industrial
Country of production: Italy
Blade: Stainless Steel Bohler N690Co at 58HRC
Blade Treatment: Brush MIL-C-13924
Handle: Forprene
Blade Length: 118mm.
Blade thickness: 5mm.
Total Length: 232mm.
Weight: 145g.
Sheath: In Kydex, compatible with M.O.L.L.E.
Packing: Cardboard box with Extrema Ratio logos12658 -
ExtremaRatio - 185 ° RAO in Sanmai Japanese steel - knife
Folding knife made upon specific requests of the department of the Italian Army 185 ° RAO ( Target Acquisition Regiment ) and is now included the eponymous department . The knife supplied differs from the calendar for the total lack of writings or logos on the blade.
Limited Edition RAO model characterized by a satin blade in Japanese rolled steel produced by Takefu Steel. to the central plate and the 420J2 (56 HRC) In the specific CoS it is used to 61,5HRC (Cobalt Special deemed superior mechanically by 25% compared to the already appreciated VG10) for the two side plates, in order to have a very high capacity cutting but at the same time a remarkable resilience and resistance to oxidation.
folding knife made upon specific requests of the Italian Department of the Army 185th RAO (Regiment Acquisition Objectives) and currently supplied to the homonymous department. The knife supplied differs from that only civil to the total lack of written or logos on the blade.
Intended Use: Military / TacticalType of production: Industrial
Production Lama: Italy
Blade: (San Mai) Japanese-rolled stainless steel with sharp CoS to 61,5HRC in cryogenic tempering
Lama Treatment: Testudo
Handle material: anticorodal 4.5mm
Blade length: 118mm.
Blade Thickness: 6.3mm.
Length closed: 142
Overall length: 261mm.
Balancing: -
Weight: 335g.
Closure: front modified lock - threaded safety pin
Clip: -
Sheath: tactical nylon by Vega with M.O.L.L.E. attacks suitable for both the closed knife that open - color BLACK
Notes: sharpening the included DiamondRAO-SANMAI -
ExtremaRatio - Resolza Stone Washed - knife pattada
Use: Sports
Type of production: industrial
Blade: Stainless steel 58HRC N690Co
Production Blade: Italy
Handle: Anticorodal
Blade length: 122mm.
Blade Thickness: 3mm.
Closed Length: -mm.
Overall length: 268mm.
Balancing: -
Weight: 93g.
Lock: Liner Lock
Clip: -
Sheath: -
Notes: -ER-RE12-SW -
ExtremaRatio - RES II - Rescue Emergency Survival - knife
Destination: Coltello multiuso di emergenza e sopravvivenza
Blades: Acciaio inox N690Co a 58 HRC
Handle: Alluminio aeronautico anodizzato anticorodal
Total Length: 260 mm.
Blade Length: 118 mm.
Blade Tickness: 4 mm.
Locking Type: liner lock
Clip: amovibile in acciaio
Weight: 330 g.
Notes: luce led - lama emergenza (lungh. 8 cm) - sega per legno (lungh. 11,5 cm) con terminale a gancio affilato - frangivetro - punte cacciavite4369
Extrema Ratio — Made in Italy Professional Tactical Excellence
Extrema Ratio stands as a global benchmark in tactical and military cutlery. Based in Prato, Italy, the company designs cutting tools built for real-world application: serving Military Entities, Law Enforcement, Special Forces, Counter-Terrorism units, and Rescue teams. Every model is created to ensure reliability, robustness, and performance even in the most critical conditions.
Military DNA
Official supplier to the Armed Forces (NATO Code AD856). Iconic models such as Col Moschin, Fulcrum, ADRA, and KH are developed based on specific operational requirements from elite Italian and international units.
⚙️ Technology + Craftsmanship
A hybrid production process: industrial precision for perfect tolerances, combined with manual finishing and sharpening performed by expert craftsmen. Every single knife is individually tested and inspected.
Advanced Materials
Beyond the renowned Böhler N690 treated to 58HRC, Extrema Ratio employs sintered steels like M390 and Nitrogen-based alloys for maximum corrosion resistance. Forprene handles are designed for total grip in any condition.
Why buy Extrema Ratio from Coltelleria Collini?
We have been Historic Official Dealers for over 25 years. Our direct collaboration with the company allows us to offer real value:
- Exclusive Limited Editions created with Extrema Ratio, including special versions in Japanese Takefu laminated steel.
- Constant availability of the most requested models and new releases updated in real-time.
- 100% original products, with official warranty and dedicated post-sales support.
- Professional custom laser engraving service.
Extrema Ratio FAQ
Primarily Böhler N690Co. Premium models employ M390 (maximum edge retention) and Nitrogen steels. Collini limited editions also feature precious Japanese laminates.
Yes. Production is entirely carried out in Prato, Italy, with total control over materials, treatments, and finishes.
It certifies Extrema Ratio as an official supplier for NATO Armed Forces. It is a standard guaranteeing quality, traceability, and military reliability.









































