At the Military Armament Corporation (MAC), Gordon Ingram designed the Ingram MAC-11 as a machine pistol during the 1970s.
The sub machine gun is a sub compact version of the Model 10 (MAC-10), and is conveniently chambered to fire the much smaller .380 ACP round. This weapon has been frequently confused with the Sylvia and Wayne Daniels M-11/9. The M-11/9 was chambered in 9mm (9x19mm) Parabellum. The M11/9 was modeled after teh M11A1 and is often viewed by many as a copy of the MAC-11 with upgrades.
Similar to the larger MAC-10, the MAC-11 has the pinhole sight welded to the receiver with open sights. These sights and their placement are for use with the folding stock, as using the sights without the stock is almost useless due to the initial jump of the weapon and its open bolt and heavy design. The MAC-11 additionally has two safety features which are also present on the Model 10A1.