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This CMMG Barrel & BCG Kit allows you to build your own AR chambered in 5.7x28mm using CMMG's outstanding Radial Delayed Blowback operating system. Unlike typical blowback systems, Radial Delayed Blowback not only reduces the weight in your BCG, it also reduces felt recoil—allowing you to stay on target and make faster follow-up shots.
Both the barrel and BCG are designed to fit CMMG's Mk57 lower or a standard AR-15 lower (when using CMMG's 5.7x28mm Conversion Magazine). The barrel is made from premium 416R stainless steel and features standard 1/2x28 threads for muzzle accessories. The bolt carrier group features a salt bath nitride finish for corrosion resistance.
If you've been dreaming about building an AR in the high-speed, deep-penetrating 5.7x28mm rounds, this is the Kit for you.