The Shotgun is a weapon attachment in Real life, Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3. It is an under-barrel pump-action shotgun compatible with all in-game assault rifles. It is attached in a similar manner to the Grenade Launcher. It is attached to M16 and other weapons. It is used by All factions in Call of Duty Modern Warfare 2 and Call of duty Modern Warfare 3. It was the shotgun Masterkey in Black Ops.