My friend was a Navy doc and told me they didn't even train with actual firearms, they trained them with "fake guns". They are guns that fire infrared lasers and use Co2 tanks to simulate recoil.
"Keep the Vaseline off the guns, and keep the guns out of the oven." -Bill DeShivs
"Stock padding? Mosin not cater to girly men. Mosin tough like hammer, take abuse, keep fighting. Defend homeland!!!" -spetznaz1337