The CMMG 5.7x28mm barrel and bolt carrier group kit has a 16.1-inch threaded barrel and uses CMMG's Radial Delayed Blowback system. It is designed to be assembled into a Mk4 or mil-spec AR-15 upper.
- Manufacturer Part # : 57D0476
- Type : Barrel and BCG Kit
- Caliber : 5.7x28mm
- Barrel Length : 16.1"
- Operating System : Radial Delayed Blowback
- Color : Black
- Fits : AR-15
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