Shotgun is charged from shell (cartridge, patron) or from removable magazine. Spring powered shotguns shoot 1 or more pellets for each load. Gas operated most common use GreenGas that can be filled to shell or to special magazin. Shotgun most often shoot more BBs at once (3 - 6 pellets) and thus increase the probability of hitting target with the first shot. Excellent and effective weapon for CQB.