The last thing you want to happen in the heat of competition or a tactical situation if for your rifle to fail because a trigger or hammer pin has "walked out" of the receiver. This easy to install pin set from Elftmann uses special steel parts that lock the pins into place in the receiver. They absolutely can not "walk out", and they are also prevented from rotating in place. Holding the pin completely stationary forces the hammer and trigger to rotate on the pin, and eliminates wear on the pin holes caused by pin rotation.