The SIG MCX is a series of rifles designed and manufactured by SIG Sauer, featuring a short-stroke gas piston system, carried over from the SIG MPX submachine gun. The rifle is produced in both selective fire and semi-automatic configurations. It is available in rifle, short-barreled rifle, and pistol (generally considered as a compact carbine) configurations.
SIG MCX with a standard folding stock
|Place of origin||United States / Germany|
2.61 kg (5.8 lb) (229 mm barrel)|
2.72 kg (6.0 lb) (406 mm barrel)
730 mm (29 in) stock folded (229 mm barrel)|
908 mm (35.7 in) stock unfolded (406 mm barrel)
229 mm (9.0 in)|
406 mm (16.0 in)
.300 AAC Blackout
|Action||Short-stroke gas-operated piston, rotating bolt|
|Feed system||30-round detachable STANAG box magazine|
|Sights||Picatinny rail for mounting iron or optical sights|
The SIG MCX was first introduced at SHOT Show 2015.
Orlando nightclub shootingEdit
The SIG MCX series features a short-stroke gas piston system to reduce recoil and improve the reliability of the weapon; this was based on the design of the earlier SIG MPX. The MCX features a system that allows for conversion between 5.56×45mm NATO, .300 AAC Blackout and 7.62×39mm ammunition, using standard 5.56 mm STANAG magazines for 5.56×45mm NATO and .300 AAC Blackout, and specially designed STANAG-compatible magazines for 7.62×39mm. The MCX is designed to deliver optimal performance with .300 AAC Blackout and an optional suppressor.
The barrel's profile is tapered at the crown to allow the installation of muzzle devices and direct-thread sound suppressors without the use of washers that degrade performance and allows the devices to self-center on installation. The barrel can be changed in a matter of seconds to another length or a different caliber. Additionally the barrels are nitride coated for corrosion resistance. It features hardened steel wear points.
All MCX variants have a forend made of aluminum with a KeyMod system to add accessories. Controls are mostly ambidextrous including the charging handle but not the bolt release. Four types of stocks are available for the MCX carbine.
- MCX Carbine: Carbine, with 16-inch (410mm) barrel. Available with a safe/semi-automatic trigger group for U.S. civilian sales, or safe/semi-automatic/fully automatic trigger group for sales to law enforcement agencies and militaries.
- MCX SBR: Short-barreled rifle, with 9-inch (230mm) barrel. Available with a safe/semi-automatic trigger group for U.S. civilian sales, or safe/semi-automatic/fully automatic trigger group for law enforcement and military sales. Under U.S. federal law, rifles with barrels shorter than 16 inches are Title II weapons, which are subject to federal restrictions, as well as being regulated by state laws.
- MCX Pistol w/ SBX: Semi-automatic pistol, with 9-inch (230mm) or 11.5-inch (290mm) barrel, SIG SBX stabilizing brace and safe/semi-automatic trigger group. This version fits the U.S. legal definition of a "handgun", in that it is only designed to be fired with a single point of contact with the shooter's body, though it is really a compact carbine rifle, as it fires an intermediate round. The BATFE previously warned users that shouldering a weapon fitted with the SIG SBX, or a similar forearm brace, and not registered as a short-barreled rifle, constitutes the making of a short-barreled rifle, which is a Title II weapon. However, as of April 2017, this is no longer the case.
- MCX Low Visibility Assault Weapon (LVAW): Short-barreled, suppressed, select-fire variant available only to law enforcement agencies and militaries. It is nicknamed "Black Mamba".
- MCX-MR (Mid Range): Semi-automatic sniper rifle chambered in 7.62×51mm NATO. It features a 16 inches (410 mm), fluted, 416 stainless steel barrel, with a 1:10 inch twist, manufactured by Bartlein Barrels. The handguard is secured via two screws, and the gas system has settings for suppressed or unsuppressed use. It weighs 8.9 pounds (4.0 kg), and features both an M16/AR-15-type charging handle and a left side charging handle, uses SR-25 box magazines, and is compatible with SR-25 lower receivers. It was SIG Sauer's unsuccessful submission for the United States Army's Compact Semi-Automatic Sniper System (CSASS) program.
- Netherlands: Netherlands Maritime Special Operations Forces
- United Kingdom: Police Counter Terrorist Specialist Firearms Officer teams
- Indonesia: Indonesian National Police Special Response Unit: Gegana Brimob POLRI
- United States:
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- Sculthorpe, Tim (3 August 2016). "ISIS, meet the C-Men: Scotland Yard shows off the first of 600 awesomely armed (and masked) Counter-Terrorism firearms officers who hit the streets today in vans, boats and MOTORBIKES". Daily Mail. Retrieved 24 March 2017.
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