Tamid, Someone was joshing you. You dont shoot a gun with a clenched jaw. First of all, a clenched jaw tightens up the masseter muscle (the chewing muscle) and is going to move your face out. You wont be lined up down the rib anymore clenching your jaw. Holding a gun too tight makes them kick more and upsets fluid motion. Just relax and shoot your gun. If you are getting cheek slap, the gun doesnt fit you.

Socialism is almost the worst.