Nothing's more annoying on a mil-spec AR-15 lower than when your trigger or hammer pins start walking, and this can cause major function issues, impeding the reliability and dependability of your rifle. Solve the issue by adding a set of these Armaspec Anti-Walk Trigger and Hammer Pins to your lower receiver. Machined from stainless steel and coated with a black-oxide finish, the Armaspec anti-walk pins are secured into place through the use of two hex screws, and the keys required for installation are included. The pins are standard .154 size, and the company recommends using thread-locking compound on the screws during installation. Pins will fit both AR-15 and AR .308 receivers, are made in the USA and are covered under Armaspec's lifetime warranty.