These BB guns are all imitations of well known "real steel" weapons. Most are realistic enough to be used for firearms training, and are very popular items to collect. They are powered by inexpensive CO2 cartridges, and shoot 4.5mm spherical metal pellets (BB shot),  making them ideal for informal short range target practice and back garden plinking. These guns load much like the real thing, and offer fast action repeated firing as rapidly as you can pull the trigger. For ultimate realism, some semi-automatic models feature true blowback operation, which provides recoil driven slide action re-cocking and a satisfying recoil kick.