Due to high demand and supply chain issues affecting many industries, some of our parts and accessories may be on backorder and have an extended lead time. Items currently on backorder can still be purchased and orders will be shipped out in the order they were received. We apologize for the inconvenience and appreciate your patience as we traverse this extremely busy time.
Barrel and BCG Kit, 5" 4140CM, SBN, 9mm
CMMG's 9mm Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using our Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, 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.
Our Barrel and Bolt Kits are designed to work exclusively with mil-spec AR-15 upper receivers with a modified ejection port, like our MkG/MkGs upper, and most mil-spec AR15 lowers when used with 9 AR Conversion mags as well as our MkGs Mk17 and Mk9* lowers. Other manufacturers’ receivers may work, but we cannot guarantee function or reliability.
*Older Mk9 lowers will require one of our retrofit kits to convert it to a Radial Delayed Blowback compatible lower, instead of Traditional Blowback.
All CMMG products come with our Lifetime Quality Guarantee.
**All NFA rules apply** See linked CMMG Resource article for more information.
|Operating System||Radial Delayed Blowback|
|Muzzle Thread||1/2 X 28|
|Gas Port Location||N/A|