Whether you're building a new Radial Delayed Blowback™ pistol caliber carbine or you just like having spare BCGs on hand, the 40 S&W bolt carrier group is just the thing. This BCG is designed specifically for use with our 5" and 8" .40 S&W barrels.
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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