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The Reciever Alignment Block is a perfect accessory for the GM-102 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 tighteining the castle nut.
Also available in the Gunner's Mount Kit!