If a swanky outfit like H&K can make an “Operational Briefcase” with a submachine gun hidden inside it, then you can bet Military Armament Corporation is going to do the same! MAC made these briefcases for both the M10 and M11 submachine guns, and made a shortened suppressor for the M10 pattern guns to fit. They actually have a distinct advantage over the H&K type by fitting a gun with suppressor - but a distinct disadvantage in the exposed trigger bar on the bottom of the case, with no safety device of any kind.

Note: Possession of the briefcase with a semiauto MAC-type pistol that fits it is potentially seen as constructive possession of an AOW. A machine gun can be legally fitted in the case, but a semiauto pistol in it is considered a disguised weapon, and thus requires registration as an AOW.