The Intratec TEC-DC9 (also known simply as the TEC-9) is a blowback-operated, semi-automatic 9x19mm Parabellum caliber firearm, classified by the U.S. Bureau of Alcohol, Tobacco, and Firearms as a handgun. It is made of inexpensive molded polymer and stamped steel parts. Magazines holding 10-, 20-, 32-, 36- and upwards of 50-round capacities are available. There are three different models, all of which are commonly referred to as the TEC-9, although only one model was actually sold under that name.
The TEC-9 was originally designed by Swedish company Interdynamic AB of Stockholm as the MP-9, intended as a cheap submachine gun based on the Carl Gustaf M/45 for military applications. Interdynamic was unable to acquire interest among governments, and the MP-9 never entered production. Unwilling to abandon the design, Interdynamic set up a U.S. subsidiary to market a semiautomatic version of the handgun to civilians. The MP-9 was redesigned by George Kellgren, and became the model KG-9, which represents the initials of the firearm's designers, George Kellgren and Carlos Garcia.