Need to assemble your new trigger group or test your existing system? Use the Strike Industries AR Trigger Hammer Tool. The jig allows you to dry fire safely and even adjust the trigger pull without using the rifle. It features a hammer bumper and won't leave scratches behind. Plus, it gives you a clear view of the sear, hammer and disconnector engagement points. StrikeIndustries Strike Industries AR Trigger Hammer Tool Black/White - Gun Cases And Racks at Academy Sports