M45D Tactical Shotgun Fires a specialized titanium pellet round, pellets are known to literally rip through targets The differences between the M45 and the M45D are mostly cosmetic, as the M45D retains the standard six-round internal magazine and firing mechanism. The M45D is unexpectedly comfortable to fire and simple to control, despite the shotgun's powerful 6 gauge cartridge and light weight. This is due to the M45D's magnetorheological recoil dampening system, which is considered very under-appreciated. The M45D shotgun does not feature a smart-linked controllable choke, unlike some M45 variants.