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Guard Barrel and BCG Kit, 8" 4140CM, SBN, 45ACP

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Guard Barrel and BCG Kit, 8" 4140CM, SBN, 45ACP

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Availability: In stock

Regular Price: $374.95

Special Price: $337.46


Quick Overview

The MkG GUARD 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, the 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.


  • 8″ Medium Taper
  • 1:16 Twist
  • 4140 Chrome Moly
  • Salt Bath Nitride Finish inside and out
  • .45acp Chamber
  • Threaded .578-28
  • Radial Delayed Blowback Bolt (Patent Pending)
  • Requires use of modified upper for reliable operation.
  • Weight: 1.6lbs

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