HK Army LAZR Barrel Kit AC 15" Polish Black Black Inserts Eclipse CS2 Grip The harder o-ring goes on

The harder o-ring goes on the bolt tip and the softer o-rings on either side of the valve port

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HK Army LAZR Barrel Kit AC 15" Polish Black Black Inserts Eclipse CS2 Grip The harder o-ring goes onHK Army LAZR Barrel Kit 15" Polish Black Inserts Autococker Threads Crafted with accuracy and style in mind, the LAZR Barrel Kit delivers unrivaled performance. The precision barrel bore honing used in the development of the LAZR allows for improved diameter uniformity and a smooth interior finish. This attention to surface detail will deliver you the ball on ball accuracy you are looking for in a high end barrel system. Easily change the control bore