holding a gun against something and firing it and holding it away from the same thing and letting it get a running go and slamming into it are 2 entirely different things. i've not tried firing an AR held against my chin but i wouldn't hesitate to do so. however, i also would not be so stupid as to hold it in FRONT of my chin and fire it. best analogy: try driving a nail by pushing on it.
i'll have to double check the next time i talk to my dad but if i remember right, he said in basic training the instructors showed them how they shouldn't be afraid of the recoil of a garand by putting the butt plate against their foreheads and firing it.
roger
