A scaled-down variant of the famous M10 SMG, the M11 made an already compact CQB weapon even more maneuverable. This particular example is bundled with an "Operational Briefcase", a piece of luggage rigged up to transport the weapon in a ready to fire condition but hidden from plain sight. A steel lever protruding from the bottom is the largest clue that something is up with the wood framed black leatherette briefcase, with an ID tag/business card holder serving to conceal the muzzle port. The interior is upholstered in gray, with a shaped hardwood block to hold the gun and the included silencer in position, a brass deflector to reduce the risk of a spent round bouncing back into the gun and causing a jam, velcro sections for accessory storage, and the aforementioned steel lever positioned to hit the trigger when moved. The combination allows the weapon to be fired instantly with the benefit of the silencer, though reloading still requires opening the case; best to make that first magazine count. Post and peep sights, with the RPB markings on the left side of the frame, MAC markings on the right, a safety switch on the underside near the trigger and a selector switch on the left. Fitted with a textured black plastic grip extension; the frame is slotted for a telescoping stock, but none is included. Also present is an extra magazine, a green cloth sling, and a barrel extension with leather belt case.

Threaded to match "A", with an expansion chamber and wipe pack to control escaping gas. With a heat protection Nomex cover.