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CMMG Radial Delayed Blowback Bolt Kit AR-15 Pistol 9mm Luger 8″ Barrel Nitride




The CMMG MkG GUARD Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using the Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, this 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. CMMG MkG Barrel and Bolt Kits are designed to work exclusively with CMMG MkG Lowers, and a mil-spec upper receiver with enlarged ejection port. Other manufacturers’ receivers may work, but we cannot guarantee function or reliability.



  • Salt Bath Nitride Finish inside and out
  • Radial Delayed Blowback Bolt (Patent Pending)
  • Requires enlarged ejection port for reliable operation


Made In United States of America

Product Information

Cartridge 9mm Luger
Color Black
Finish Nitride
Material 4140 Chrome Moly Steel
Extra Features Radial Delayed Bolt Carrier Group
Length 8 Inches
Weight 1.7 Pound
Twist 1:10
Threads 1/2″-28
Barrel Contour Medium
Chrome Lined No
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight

1.850 Pounds


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