Centurion Arms MK12 Mod 1 - KAC Long FF RAS Rail - 5.56mm Rifle 18" Barrel

Centurion Arms MK12 Mod 1 - KAC Long FF RAS Rail - 5.56mm Rifle 18" Barrel

Build your precision arsenal with the Centurion Arms MK12 Mod 1 w/ KAC Long FF RAS 5.56 NATO Rifle. Purpose-built for designated marksman rifle (DMR) roles and long-range accuracy, this platform faithfully captures the legendary Mk12 Mod 1 architecture while incorporating modern duty enhancements. At its core is an 18-inch air-gauged match stainless steel barrel paired with a Knight’s Armament Long Free-Float RAS handguard, offering a rigid, non-deflecting, quad-rail platform engineered for pin-point shot placement and stable bipod or optic mounting.

Forged from Mil-Spec CM4 aluminum receivers with M4 extended feed ramps, the Centurion MK12 Mod 1 comes equipped with high-tier operational components. It features a Centurion Sandcutter chrome bolt carrier group with an E4 tapered lug bolt for ultra-reliable cycling in dirty environments, a Centurion AST two-stage trigger for crisp shot control, and an M84 Gas Buster® charging handle to mitigate gas face when running suppressed. Complete with an OPS Inc. muzzle brake and collar, an Ergo grip, and a B5 Systems adjustable stock, this rifle is complete and ready for demanding precision shooting.

Features

18" Air-Gauged Match Stainless Barrel:
Precision-machined, air-gauged 18-inch stainless steel match barrel with a 1:7 RH twist, polished M4 feed ramps, and a protective Black Cerakote finish for match-grade consistency.

Knight’s Armament Long Free-Float RAS:
Iconic KAC Long FF RAS quad-rail handguard isolates barrel harmonics while providing solid, full-length Picatinny rail space for optics, bipods, and accessories.

Centurion Sandcutter Chrome BCG w/ E4 Bolt:
Features hard-chrome plating with exterior sand-cutting grooves that clear debris out of the receiver, paired with a durable E4 tapered lug bolt.

Centurion AST Two-Stage Trigger & Gas Buster® Handle:
Match-grade two-stage trigger delivers a clean, predictable break, complimented by an M84 Gas Buster® charging handle with an oversized latch to route blowback away from the shooter.

OPS Inc. Muzzle Brake & Collar System:
Outfitted with a Crane-spec pinned MK12 gas block and an OPS Inc. muzzle brake and alignment collar system, pre-configured for OPS Inc. and Allen Engineering suppressor mounting.

Specifications