Cross Armory''s Pin Pal provides a more durable pin system to prevent undue wear on the forward pivot point of your AR. The bearing can be press fit without special tools, and won''t permanently alter your weapon. It is easily removable should you choose to return to your factory configuration. The Pin Pal system includes a front takedown pin replacement with a locking nut machined from 4140 Ordnance Steel for extreme durability, and a lubricated captive bearing. It has a black melonite hard coat finish. This Pin Pal model utilizes a brass alloy bearing. It fits any standard AR-10 configuration, and installs easily on virtually all AR-10 weapons. NOTE: It is not compatible with the M&P 10.