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The CMMG 99D17C3 is a 9mm Barrel and BCG Kit by CMMG that enables you to construct a Pistol Caliber Carbine utilizing CMMG's innovative Radial Delayed Blowback System. The RDB system stands out from typical direct blowback systems as it requires the bolt to rotate and unlock, which in turn slows down the BCG. This leads to a lighter BCG, making the rifle itself lighter and reducing the felt recoil compared to a straight blowback system.
Designed specifically for use with mil-spec AR-15 upper receivers that have a modified ejection port, such as the MkG/MkGs upper, these Barrel and Bolt Kits are also compatible with most mil-spec AR15 lowers. This compatibility extends to usage with 9 AR Conversion mags as well as their MkGs Mk17 and Mk9* lowers. Although other manufacturers' receivers may function, the guarantee for function and reliability only applies to compatible components.
For older Mk9 lowers to become compatible with the Radial Delayed Blowback system, they would require one of CMMG's retrofit kits, making the conversion from a Traditional Blowback possible.
