Whether you're building a new Radial Delayed Blowback™ AR or you just like having spare BCGs on hand, the 9mm MkGs 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.
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