CMMG BBL AND BCG KIT 16.1 5.7X28MM

The CMMG BBL and BCG Kit features a 16.1-inch barrel chambered in 5.7x28mm, designed for compatibility with AR-style rifles. This kit incorporates CMMG's innovative Radial Delayed Blowback operating system, which offers a notable reduction in bolt carrier group weight compared to traditional direct blowback mechanisms. This system enhances cycling reliability while contributing to a smoother shooting experience with reduced recoil impulse.

Engineered to be assembled into a Mk4 or mil-spec AR15 upper receiver, the kit pairs seamlessly with either a CMMG Mk57 lower or a standard AR15 lower when used with CMMG’s 5.7 AR Conversion Magazines. The black-finished barrel and bolt carrier group are optimized for durability and consistent performance, making this kit a solid foundation for building a customized 5.7x28mm AR pistol or short-barreled rifle.