CMMG Barrel and BCG Kit 5.7x28mm 5" Black - 57DBC33

This CMMG Barrel and BCG Kit includes a 5" 5.7x28mm barrel and bolt carrier group designed for AR-15 platforms using CMMG's Radial Delayed Blowback operating system. The kit features chrome moly steel or stainless steel construction with a 1:9 twist rate and 1/2-28 muzzle thread pitch. Installation is a drop-in design compatible with mil-spec AR-15 uppers and works with CMMG Mk57 lower receivers or standard AR-15 lowers.