Product Summary
The CMMG 5.7x28mm Barrel and BCG Kit allows you to build a high-performance AR-15 chambered in the versatile 5.7x28mm caliber. This kit features a 16.1-inch 4140CM barrel with a nitride finish and utilizes CMMG’s patented Radial Delayed Blowback system to reduce felt recoil and BCG weight. It is designed for assembly into a mil-spec AR-15 upper receiver, making it an ideal choice for shooters wanting a lightweight, low-recoil platform. This kit is compatible with either a CMMG Mk57 lower or a standard Mk4/AR-15 lower when used with CMMG 5.7 AR conversion magazines.
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