The SIG MCX is a family of firearms designed and manufactured by SIG Sauer, produced in both selective fire and semi-automatic only models, and features a short-stroke gas piston system, which is inherited from the earlier SIG MPX submachine gun.
Barrel length: 229 mm (9.0 in); 292 mm (11.5 in); 406 mm (16.0 in)
Effective firing range: MCX Carbine 5.56×45mm NATO: 1,650 ft (503 m)
Feed system: 30-round detachable STANAG box magazine
Rate of fire: 800 rounds/min
Length: 730 mm (29 in) stock folded (229 mm barrel); 908 mm (35.7 in) stock unfolded (406 mm barrel)
Action: Short-stroke gas-operated piston, rotating bolt
Muzzle velocity: MCX Carbine 5.56×45mm NATO: 3,000 ft/s (914 m/s)