The inspecting NCO also checked the trigger and hammer for serviceability. 1. He would bring the hammer to half-cock and squeeze the trigger. If the hammer falls, the weapon has failed. 2. He would bring the hammer to full-cock and apply pressure to it using the thumb. If the hammer falls to half-cock, the weapon fails. 3. He would check the tightness of the hammer screw and the cleanliness of the nipple.