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PRODUCT #40D732D

Barrel and BCG Kit, 8" 4140CM, SBN, 40 S&W

$474.95

$474.95

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, 8" 4140CM, SBN, 40 S&W

The CMMG® 8” 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.

Technical Specifications

Platform MkGs
Caliber .40 S&W
Operating System Radial Delayed Blowback
Barrel Length 8
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 1.7 lbs

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