MAC-10

The MAC-10 (Military Armament Corporation Model 10, Officially the M10) is a very compact machine pistol developed by Gordon Ingram in 1964.

It is a simple and very compact design, making it very easy and simple to mass-produce.

However, those factors and its incredibly high rate of fire (1090 rpm for the 9mm model and 1145 rpm for the .45 ACP model) make it very difficult to control the gun in full-auto. This meant that the MAC-10 didn't really find much success with the US Military, but it did see limiter service in Vietnam.

It also must be noted that it was used by the Special Air Service prior to their adaption of the MP5.

In Call of Duty 4: Modern Warfare (Nintendo DS)
The MAC-10 is unique to this game. It is basically the Mini-Uzi from the Console games. It has a 40-round magazine and a much slower rate of fire than in real life, this is because the DS cannot handle those kinds of firing speeds. It is an overall good gun because of its large magazine.