The MAT-49 had a short, retractable wire stock, which when extended gave the weapon a length of , and the magazine well and magazine could be folded forward parallel to the barrel for parachute jump or with a 45° angle hence allowing a safe carry until the magazine well is brought back to vertical position before opening fire. Barrel length is , with the MAT-49/54 manufactured with extended barrels and non-retractable wooden stocks. As issued, the MAT-49 fires a
9×19mm Parabellum cartridge, using a single-column 20-round magazine for desert use or 32-round similar to the
Sten magazine. The MAT-49 is
blowback-operated and box magazine-fed, with a cyclic
rate of fire of 600 rounds per minute. Some of the MAT 49/54s, modified MAT-49s manufactured for police forces, had two triggers, allowing use of full-auto fire or single shots, but most were manufactured as full-auto only. Minus magazine, the MAT-49 weighs about , which is heavy for a submachine gun. The weapon incorporates a
grip safety which is located on the backside of the pistol grip. The rear sights are flip-up and L-shaped, and marked for a range of . Production ceased before the introduction of the
FAMAS assault rifle in 1979. ==Variants==