Present Arms AR-15 Receiver Alignment Block - AR15RAB

The Receiver Alignment Block is a perfect accessory for the Present Arms Gunner’s Mount. It is cut to the profile of the receiver extension tube. With the Lower Receiver securely fitted to the Lower Receiver Repair Block (AR15LRB) the receiver extension is held securely in a true 12-6 position when breaking or tightening the castle nut.