Extrema Ratio S2 G.O.I. Black fixed-blade knife, image 1 of 5

Extrema Ratio S2 G.O.I. Black fixed-blade knife, image 2 of 5

Extrema Ratio S2 G.O.I. Black fixed-blade knife, image 3 of 5

Extrema Ratio S2 G.O.I. Black fixed-blade knife

≈ $485

Price at the dealer: 432 €. Converted at the ECB rate as of October 19, 2026.

No permit required (18+)

7500 Tournai, Belgium

ID: 10831373

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About the seller

Armurerie Billau

Dealer

5,135 listings

Details

Original language

French

Category

Condition

New

Location

7500 Tournai, Belgium

Availability

In stock

Freshness

This listing is based on a mirrored offer, where the listing data was synced to us from a shop, dealer, or external marketplace. Please note that temporary price discrepancies may occur due to possible delays in data transmission.

Source: Armurerie Billau
Last updated: about 13 hours ago

Description

Note: The item is located abroad. Please note that delivery conditions, shipping times, and/or the purchase process may differ.

S 2 G.O.I. has been adopted by Italian Navy Special Forces is the development of S.E.R.E. 1, created by a study group composed of Special Forces operators, martial arts and experts in survival techniques. This variant has been redesigned following the requests of the Italian Navy Seals. The acronym stands for “Survival, Evasion, Resistance and Escape”, the four cornerstone concepts for training courses administered to high risk of capture military personnel. S 2 G.O.I. is projected both as point works and cutting works. The unique grip, unlike the classic blades of this type, is designed to be wielded with the blade projecting between index and middle finger, forming a single straight line from blade-tip to wrist, and also allowing for reverse grip. The handle has the same ergonomics as the butt of a firearm; this grip allows an instinctive and immediate use. The tip is shaped to maximize penetration, while its deltoid profile grants it toughness. One edge is partially serrated – useful for cutting ropes – while the opposite edge features a standard design halyard-cutter, which has interchangeable blades. The central blade hole, which has the dual function of making the blade lighter and turn-crickets, recalls the maritime origins of its creators. The peculiarity of the knife is that it has been specifically designed to be used even without the handle; the two holes in the part dedicated to the handle facilitate assembly. The kydex sheath has a basic retention that can be used alone for operators who need extremely fast knife use, and a removable locking lock if necessary. The knife comes with double safe to be fixed both on right and left side. An insert with a flat-blade screwdriver is available as an accessory. It comes with belt clip for belt fastening and paracord for fixing on the M.O.L.L.E. system. “To use a gun, a knife or another weapon for us is the same thing: it is only the extension of our hand.” Quote from a Commander of the G.O.I. department.

TECHNICAL SHEET

WEIGHT G.: 306

WEIGHT OZ.: 10,79

BLADE LENGTH (MM): 148

BLADE LENGTH (IN): 5.82

TOTAL LENGTH (MM): 217

TOTAL LENGTH (IN): 8,543

BLADE THICKNESS (MM): 6,3

BLADE THICKNESS (IN): 0,248

BLADE MATERIAL: BÖHLER N690 STEEL (58HRC)

BLADE FINISHING: MIL-C-13924 BURNISHING

MAIN GRIND: FLAT

PARTIAL SERRATION (MM): 50

PARTIAL SERRATION (IN): 1,968

HANDLE MATERIAL: FORPRENE

Extrema Ratio S2 G.O.I. Black fixed-blade knife

Armurerie Billau

Details

Freshness

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