Bolt Carrier Group, 5.7x28mm

Whether you're building a new Radial Delayed Blowback(TM) AR or you just like having spare BCGs on hand, the 5.7x28mm bolt carrier group is just the thing. Compatibility:CMMG Radial Delayed Blowback BCGs are desgined exclusively to operate with CMMG Radial Delayed Blowback barrels and will not operate with traditional AR style barrel extensions. All CMMG products are backed by our Lifetime Quality Guarantee.Learn More.