MAC-10

 The MAC-10 (Military Armament Corporation Model 10, Also known as M-10) is a highly compact, blowback operated machine pistol developed by Gordon B. Ingram in 1964. It was used by the United States in The Vietnam War by special forces such as Long Range Reconnaissance Patrols (LRRPs) or Navy Seals.

Battlefield: Bad Company 2: Vietnam
The MAC-10 is set to be featured in the Battlefield: Bad Company 2 Expansion, Battlefield: Bad Company 2: Vietnam. It is issued to the engineer class.