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The MP5K is a compact version of the famous Heckler & Koch MP5 submachine gun chambered in 9x19mm. The K stands for Kurz, German for short, with the weapon being significantly shorter than the standard MP5. It uses a roller-delayed blowback action inherited from the HK G3 rifle. The MP5K has a 115 mm barrel and a vertical foregrip instead of a standard handguard. It is designed for concealed carry by plainclothes security personnel and special operations forces.

The Bergmann MP-18 is the world's first practical submachine gun, designed by Theodor Bergmann in 1918. It was developed for the German Army during World War I to provide infantry with a high volume of close-range firepower. The MP-18 fires the 9x19mm Parabellum cartridge from a 32-round drum magazine. It uses a simple blowback action with an open bolt. The MP-18 established the basic concept of the submachine gun that would dominate close-quarters battle for decades.

The Beretta M12S is an improved version of the Beretta PM12 submachine gun, a blowback-operated weapon in 9x19mm. It features a telescoping bolt design that allows a compact overall length while maintaining a longer barrel. The M12S relocated the safety from the rear of the receiver to the trigger guard for easier access. It has a 200 mm barrel and a cyclic rate of 550 rounds per minute. The M12S was adopted by Italian military and police forces as well as numerous other countries.