The SIG MCX with a standard folding stock
|Type||Assault rifle |
|Place of origin||Germany|
|Unit cost||MCX VIRTUS Patrol: MSRP $2,233 USD|
MCX VIRTUS SBR: MSRP $2,233 USD
MCX VIRTUS Pistol: MSRP $2,235 USD 
|Mass||2.61 kg (5.8 lb) (229 mm barrel)|
2.72 kg (6.0 lb) (292 mm barrel)
|Length||730 mm (29 in) stock folded (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)
.300 AAC Blackout
|Action||Short-stroke gas-operated piston, rotating bolt|
|Rate of fire||900 RPM|
|Muzzle velocity||MCX Carbine 5.56x45mm NATO: 3,000 ft/s (914 m/s) |
|Effective firing range||MCX Carbine 5.56x45mm NATO: 1,650 ft (503 m) |
|Feed system||30-round detachable STANAG box magazine|
|Sights||Picatinny rail for mounting iron or optical sights|
The SIG MCX is a series of firearms designed and manufactured by SIG Sauer, produced in both selective fire and semi-automatic only configurations, and features a short-stroke gas piston system, which is carried over from the SIG MPX submachine gun.
The SIG MCX was first introduced at SHOT Show 2015.
Orlando nightclub shooting
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. SIG Sauer is yet to deliver the 7.62×39mm configuration and has removed the calibre as an option in their official website.
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-centre on installation. The barrel can be changed in a matter of seconds to another length or a different calibre. Additionally the barrels are nitride coated for corrosion resistance. It features hardened steel wear points.
All MCX variants have a forend made of aluminium 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.
SIG Sauer offers the rifle in semi-automatic only in three different configurations for the civilian market:
- The SIG MCX being the standard configuration of the rifle with a 406 mm (16 in) barrel.
- The SIG MCX SBR is the short-barreled rifle configuration of the rifle with a 229 mm (9 in) barrel. (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).
- The SIG MCX Pistol is the pistol configuration of the rifle with a 229 mm (9 in) barrel or 292 mm (11.5 in) barrel and comes either with the SIG Sauer SBX (pistol stabilising brace) or SIG Sauer PCB (pistol pivoting contour folding brace). (This configuration 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).
The SIG MCX Low Visibility Assault Weapon (LVAW) is a short-barreled, suppressed, select-fire variant available only available to the military and law enforcement agencies. It is nicknamed as the "Black Mamba".
SIG MCX VIRTUS
The SIG MCX VIRTUS is the second generation of the SIG MCX series and was introduced in 2017.
- The SIG MCX VIRTUS Patrol is the standard configuration that features a 406 mm (16 in) barrel, a 1:7 inch twist, a custom Sig Matchlite Duo Trigger for improved accuracy, a folding and collapsing 5-position stock, four handguard lengths to choose from, interchangeable barrels and a special internal recoil system.
- The SIG MCX VIRTUS SBR is the short-barreled rifle configuration of the MCX VIRTUS. It features a barrel an 292 mm (11.5 in) barrel for the 5.56×45mm NATO calibre, and a 140 mm (5.5 in) barrel and 229 mm (9 in) barrel for the .300 AAC Blackout calibre.
- The SIG MCX VIRTUS Pistol is the pistol configuration of the MCX VIRTUS which futures an SBX stabiliser brace. It features a barrel an 292 mm (11.5 in) barrel for the 5.56×45mm NATO calibre, and a 229 mm (9 in) barrel for the .300 AAC Blackout calibre.
SIG MCX RATTLER
The SIG MCX RATTLER features a 140 mm (5.5 in) barrel and comes either in short-barreled configuration or with a SIG Sauer PCB (pistol pivoting contour folding brace). It is available in 5.56×45mm and .300 AAC Blackout.
The SIG MCX-MR (Mid Range) is SIG Sauer's unsuccessful submission for the United States Army's Compact Semi-Automatic Sniper System (CSASS) program. It is chambered in 7.62×51mm NATO and has selective fire capabilities. It weighs 8.9 lb (4.0 kg) and features a 406 mm (16 in) fluted, 416 stainless steel barrel, with a 1:10 inch twist, which is manufactured by Bartlein Barrels. The gas system features suppressed and unsuppressed settings. Unlike the handguard of the MCX, which slides off after pulling the front pivot pin, the MCX-MR requires popping off two screws first. It features both an M16/AR-15 type charging handle and a left side charging handle. It is uses a 20-round magazine and is also compatible with SR-25 lower receivers for use of SR-25 box magazines.
- Australia: Victoria Police Special Operations Group used the SIG MCX SBR configuration.
- Canada: Saskatchewan Conservation Officers.
- Denmark: Danish Armed Forces used by navy special forces Frogman Corps (Denmark).
- Finland: Police of Finland used by some operators
- France: French Special Forces used by some CPA10 operators
- Germany: Berlin Police, 300 modified rifles to meet the police's requirements were ordered in October 2017 plus an additional 160 rifles for the SEK of Berlin Landespolizei of Schleswig Holstein, 531 units ordered.
- Indonesia: Indonesian National Police Special Response Unit: Gegana Brimob POLRI.
- Malta: Used by the Armed Forces of Malta.
- Netherlands: Used by the Netherlands Maritime Special Operations Forces, Dienst Speciale Interventies.
- Poland: Jednostka Wojskowa Grom acquired the SIG MCX and MCX Rattler in 300 BLK with conversion kits to 5.56×45mm NATO and 7.62×39mm ammunition.
- Portugal: Polícia de Segurança Pública acquired SIG MCX in 5.56×45mm NATO used by Special Operations Group (Portugal).
- United Kingdom: Police Counter Terrorist Specialist Firearms Officer teams.
- United States: USSOCOM Rattler conversion kit in .300 AAC Blackout.
- Switzerland Police cantonale Genève.
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