CMMG M4-LEP II .223 REM/5.56 NATO 16" 4140 Steel

CMMG Upper Complete for M4-LEP II. The upper is built off the standard forged A3 receiver with M4 feed ramps. The chrome plated gas piston is mounted in a solid one piece steel gas block attached to the barrel by pins. The Gas Block's 1913 Piccatinny rail is receiver height and requires a front sight designed to be mounted on the same plane as the rear sight. The dedicated, piston specific, anti-tilt bolt carrier is one piece, machined with the piston impingement key (not a bolt on). The carrier uses the standard Mil-Spec bolt. The barrel is 4140 steel, M4 profile, 5.56mm chamber and bore, 1:9 twist ratio and 1/2x28 threaded barrel and has the proprietary WASP surface treatment. The upper is finished with M4 Handguard caps, M4 handguards and as A2 flash hider installed with a crush washer.