SIG MCX
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. The MCX is available in rifle, carbine, short-barreled rifle, and pistol configurations (the latter configuration generally conforming to the definition of a compact carbine but for taking a pistol brace rather than a buttstock).
| SIG MCX | |
|---|---|
SIG MCX with a standard folding stock | |
| Type | Assault rifle Carbine Semi-automatic rifle |
| Place of origin | United States |
| Service history | |
| In service | 2015–present |
| Production history | |
| Manufacturer | SIG Sauer |
| Unit cost | MCX VIRTUS Patrol: MSRP US$2,233 MCX VIRTUS SBR: MSRP US$2,233 MCX VIRTUS Pistol: MSRP US$2,235 |
| Produced | 2015–present |
| Variants | See Variants |
| Specifications | |
| Mass | 2.61 kg (5.8 lb) (229 mm barrel) 2.72 kg (6.0 lb) (292 mm barrel) 3.6 kg (7.9 lb) (406 mm barrel) |
| Length | 730 mm (29 in) stock unfolded (229 mm barrel) 908 mm (35.7 in) stock unfolded (406 mm barrel) |
| Barrel length | 229 mm (9.0 in) 292 mm (11.5 in) 406 mm (16.0 in) |
| Cartridge | 5.56×45mm NATO .300 AAC Blackout |
| Action | Short-stroke gas-operated piston, rotating bolt |
| Rate of fire | 800–900 rounds/min |
| Muzzle velocity | MCX Carbine 5.56×45mm NATO: 3,000 ft/s (914 m/s) |
| Effective firing range | MCX Carbine 5.56×45mm NATO: 1,650 ft (503 m) |
| Feed system | 30-round detachable STANAG box magazine |
| Sights | Picatinny rail for mounting iron or optical sights |
The MCX was further developed into the SIG MCX Spear, which was adopted in its .277 Fury chambering as the XM7 by the U.S. Army in 2022.
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