Caliber: 5.56 NATO. Capacity: Magpul Custom G2 MOE 30-round magazine, black with Flat Dark Earth ribs. Barrel: 16", lightweight mid-length, 1:8 twist, M4 feed ramps on both barrel extension and upper receiver. Stock: B5 Systems Custom SOPMOD Stock, Flat Dark Earth, B5 Systems QD end plate. Sights: Full-length top rail. Weight: 6.9 lbs. Trigger: ALG Defense Advanced Combat Trigger. Overall Length: 33" to 35". Features: Premium match barrel machined from either 416-R Stainless Steel or 4150-11595 mil-spec material, 5.56 match chamber. Enhanced A3M4 upper receiver, upgraded fire control group, ambidextrous selector switch and WarZ triggerguard, bolt catch and charging handle. Low-mass sand-cut bolt carrier group with nitride finish. DuraCoat finish in Flat Dark Earth over the hard-coat anodized lower receiver, upper receiver and handguard. 4140-steel MK12-style low-profile, set-screw gas block, stainless steel mid-length gas tube. Midwest Industries 15". Combat Series M-LOK free-float handguard. Magpul Custom MIAD Modular Pistol Grip, Flat Dark Earth with black two-tone. DSArms Enhanced FDE alloy triggerguard, SureFire Pro Comp (1/2x28 tpi).