CLEARANCE - CMMG GUARD Radial Delayed Blowback 5.7 x 28mm BCG ONLYThis item is clearance because it came from a partial barrel kit. It's brand new and fully functional.
CMMG's patented Delayed Blowback 5.7 x 28mm system substantially reduces recoil compared to standard blowback 5.7 or AR57 builds.
Our AR57 BCG allows you to build a Pistol Caliber Carbine using our Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system.
Whether you're building a new Radial Delayed Blowback 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 NFA/ATF Rules Apply