You will be lost if you ever get a chance to shoot a "real one." Can't hit much with one but I've never seen anyone shoot my friend's without wearing a huge **** eating grin.
I thin I have pics somewhere of a rifle (S&W) that came back to a shop in Macon where the owner fired "sub sonic ammo" in it. Destroyed it. 300 BO in a 5.56mm chambered rifle.