This guide details a simple DIY modification to prevent slippage when torquing AR-15 castle nuts using a Present Arms Gunners Mount. By cutting and fitting a piece of 1 1/4 inch PVC pipe over the receiver extension, a snug interface is created for the castle nut wrench, eliminating play and protecting the components from damage. This technique is applicable to various castle nut wrenches, including Magpul and Forward Control Designs models.
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