The Spectre M4 is an Italian blowback-operated submachine gun designed for counter-terrorist and special operations units. It is chambered for 9x19mm Parabellum .
It utilizes a double-action/single-action trigger group. It features a foldable stock and ambidextrous controls; the bolt catch and selector lever are able to be engaged from either side of the weapon. It is just under 14 inches with the stock folded and accepts 30 and 50 round 9mm magazines using a four column stacking system, and the magazine release is a lever near the bottom of the magazine well, in front of the trigger guard. Some models feature a vertical foregrip.