MAS-38

The Star Z-70B is a selective-fire submachine gun manufactured by Star Bonifacio Echeverria of Spain. It was chambered in 9x19mm Parabellum and used a blowback action. The weapon was an improved version of the earlier Z-62 model. It featured a telescoping bolt and a side-folding metal stock. The Z-70B was adopted by the Spanish military and other nations.

The PP-90 is a folding submachine gun developed by the KBP Instrument Design Bureau of Russia. It was designed as a concealed carry weapon for VIP protection and special operations. The weapon folds completely flat for storage and can be deployed rapidly by rotating the two halves apart. It was chambered in 9x18mm Makarov. The PP-90 is one of the most compact submachine guns ever produced.

The United Defense M42 is an American submachine gun designed by Carl Swebilius. It was produced for the Office of Strategic Services during World War II. The M42 uses a blowback action chambered in 9x19mm Parabellum and feeds from a 25-round box magazine. It features a wooden stock, a perforated barrel jacket, and a folding magazine well. The weapon was designed to be compact and concealable for clandestine operations. It was one of the first submachine guns designed specifically for intelligence and special operations work.