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Guard Barrel and BCG Kit, 8" 4140CM, SBN, 9mm

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Guard Barrel and BCG Kit, 8" 4140CM, SBN, 9mm

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Availability: In stock

Regular Price: $374.95

Special Price: $337.46


Quick Overview

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, 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.

The MkGs Barrel and Bolt Kits are designed to work exclusively with our MkGs Lowers. Other manufacturers lowers may work, but we cannot guarantee function or reliability.


8″ Medium Taper
1:10 Twist
4140 Chrome Moly
Salt Bath Nitride Finish inside and out
9×19 NATO Chamber
Threaded 1/2-36
Radial Delayed Blowback Bolt (Patent Pending)
Requires use of modified upper for reliable operation.
Weight: 1.7lbs

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