| Platform | MkGs |
| Caliber | .40 S&W |
| Operating System | Radial Delayed Blowback |
| Barrel Length | 5 |
| Barrel Twist | 1:16 |
| Barrel Contour | MT |
| Barrel Material | 4140CM |
| Barrel Twist | 1:16 |
| Muzzle Thread | 0.578 x 28 |
| Gas Port Location | N/A |
| Gas Block | N/A |
| Finish | SBN |
| Weight | 1.4 lbs |
AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Barrel and BCG Kit, 5" 4140CM, SBN, 40 S&W
The CMMG® 5” 40 S&W MkGs 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, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter pistol or rifle, and less felt recoil than a straight blowback system.
Our MkGs Barrel and Bolt Kits are designed to work exclusively with our MkGs Lowers. Other manufacturers’ receivers may work, but we cannot guarantee function or reliability.
**All NFA rules apply** See linked CMMG Resource article for more information.
All CMMG products come with our Lifetime Quality Guarantee.