What's with all the people saying a "Masterkey is a must"? Prior to CoD Black Cops, it wasn't even really heard of. In my opinion, it doesn't fit at all with the setting of the game. The US military equipment there is either A ) sold to the Chernarus military or B ) indicative of a failed US military response to a violent epidemic. If A ) I highly doubt that the US would provide an under-barrel shotgun to a former Soviet bloc nation who's main goal is regional stability. (Pretty sure they didn't provide any Masterkey's to Georgia.) Or B ) in which case, there's no reason to equip your standard soldier with a weapon used for close-quarters, door breaching, when it's main goal is large scale security/prevention. It's not standard equipment, and there's almost no reason to have one. You want a shotgun, find one. You want an M4, find one.