This is a short gun - three shells in the magazine, one in the chamber. In real life, the recoil from such a heavily-chopped shotgun would be ferocious, and I think only a very light load of shot would be plausible. In airsoft, recoil is all but non-existent, but a light load is still required because, just as with the other Maruzen shotguns, the overall power output of the gas mechanism is lousy...