Centurion Arms MK12 Mod 0 556/223 18" 1x30RD Mag BLK TB Flip-up Sights

The MK12 rifle was one of the beginning stages of "enhanced carbine" concept. The original designation as SPR was intended to mean Special Purpose Receiver but the system was eventually type classified by the Navy as a standalone rifle and designated MK12 Mod 0/.1. The concept started with the idea of having a sniper/designated marksman upper receiver for a special operator's standard M4 lower receiver but during initial testing and limited fielding Naval Surface Warfare Center, Crane Division delivered the upper receiver with their own lower so the testing units would not have to deplete the units operational weapons to support the testing. The lowers supplied were mostly M-16A1 lowers with Knights Armament match triggers installed and fixed butt stocks.

--Centurion Arms 18" MK12 5.56mm stainless match air gauged barrel with 1 in 7" twist, Cerakoted Black
--Upper receiver is a standard forged Mil-Spec with M4 extended feed ramps
--PRI flip-up front sight (in place of standard MK12 gas block) and the ARMS, Inc #40 flip-up rear
--Rail: PRI Gen III Handguard, and the addition of the PRI SPR Straight Top Rail
--OPS Inc Brake and Collar

--BCG: Centurion Arms Chrome Sandcutter BCG w/E4 Tapered Lug Bolt

--M84 Gas Buster® Charging Handle - Military Big Latch

--Lower
--Centurion Arms CM4 Forged Lower Receiver
--Receiver Plate-Standard 
--Trigger: Centurion Arms 2-Stage Advanced Sniper Trigger (AST)
--Trigger Guard: Aluminum Winter Trigger Guard
--Buffer: Rifle
--Grip: Ergo Black
--Stock: A2 Standard