Centurion Arms MK12 Mod 1 w/ KAC FF — 18" 5.56 NATO Rifle

The Centurion Arms MK12 Mod 1 w/ KAC Long FF RAS is a 5.56 NATO AR‑pattern rifle built to a Mk12 Mod 1–style configuration. It pairs an 18" match stainless barrel with a Knight’s Armament long free‑float RAS for a stable, free‑floating platform suited to designated marksman and precision‑oriented applications. Key components include a Centurion Sandcutter BCG, M84 Gas Buster® charging handle, and a two‑stage AST trigger for improved shot control.

Key features

• Knight’s Armament Long Free‑Float RAS (FF RAS) for rigid, accessory‑ready mounting
• Centurion Crane‑spec pinned MK12 gas block and mid‑length gas system
• Centurion Sandcutter chrome BCG with E4 tapered lug bolt
• Centurion OPS Inc. muzzle brake & collar (configured for suppressor interface as shown)
• M84 Gas Buster® charging handle (oversized latch) for positive manipulation
• Centurion AST two‑stage trigger for controlled breaks and consistent follow‑ups
• Forged Mil‑Spec CM4 upper and lower receivers with M4 extended feed ramps
• Ergonomic controls: aluminum winter trigger guard, Ergo grip, A2 stock

Technical specifications

• Caliber: 5.56 × 45 mm NATO
• Barrel: 18" stainless match, air‑gauged, 1:7 RH twist, polished feed ramps, Cerakote black
• Handguard: Knight’s Armament Long Free‑Float RAS (KAC FF RAS)
• Gas system: Mid‑length with Centurion pinned MK12 gas block
• Muzzle device: OPS Inc. brake & collar (as configured)
• Upper/Lower: Forged CM4 receivers, M4 extended feed ramps