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 ).
19-614: 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. The SIG MCX was first introduced at SHOT Show 2015. The rifle was originally designed by SIG USA, the subsidiary of SIG Sauer based in New Hampshire . In 2016, SIG recalled some of the rifles that had the first-generation bolt carrier group . It has been used by various SWAT teams and militaries, including
38-578: A 7.62x39mm version with custom 28 round AR-pattern magazines. The SIG MCX SPEAR was developed as SIG Sauer's submission for the United States Army Next Generation Squad Weapon (NGSW) program and is chambered in 6.8×51mm SIG Fury cartridge. SIG Sauer was chosen as the winner on 19 April 2022, formerly designated as the XM5 then was later changed to the XM7 in U.S. military service. SIG MCX Spear The SIG MCX-SPEAR
57-448: A carbine , the civilian model features 11.5-inch (290 mm) or 16-inch (410 mm) barrel and a Picatinny rail tail interface for attaching either a buttstock or a pistol brace. The military model features both of these options, with the addition of 14.5-inch (370 mm) and 9-inch (230 mm) barrels, as well as a custom two-stage match grade select-fire trigger group. It is available in 5.56 mm NATO , .300 Blackout and
76-599: A 140 mm (5.5 in) barrel, and comes with a Picatinny rail tail interface for attaching either a compact buttstock or a folding PCB (pistol contour brace). In February 2018, USSOCOM ordered upper receiver group conversion kits for the MCX Rattler in .300BLK for evaluation. The MCX Rattler was later selected as the winner of SOCOM's Commercial Personal Defense Weapon (CPDW) contract in May 2022 and suppressed MCX Rattlers will be ordered in 5.56 and .300BLK. The SIG MCX-SPEAR LT
95-493: A forend made of aluminum with a KeyMod system to add accessories while second generation MCX variants have an M-LOK handguard. Controls are mostly ambidextrous including the charging handle but not the bolt release. Sig produces four stock configurations are available for the MCX carbine. The overall layout of the two rifles is similar. SIG designed the upper receiver to be compatible with standard AR-15 and M16 lower receivers with
114-406: 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
133-772: Is a multi-caliber rifle developed by the American division of SIG Sauer from the SIG MCX series of carbines. The SIG MCX-SPEAR is primarily chambered in .277 SIG FURY but can be adapted to 7.62×51mm NATO and 6.5mm Creedmoor with a barrel change. In January 2019, the United States military began the Next Generation Squad Weapon Program to find replacements for the M4 carbine and M249 light machine gun . In September 2019, SIG Sauer submitted their designs. The XM7 rifle
152-618: Is the third generation of the SIG MCX, introduced in 2022. With the release of the MCX LT, SIG also designed a new, padded, side-folding stock with an FDE finish option to match the rifles, which civilian versions of the rifle variant are sold with. While the civilian variant is referred to as the "SPEAR LT", referencing the SPEAR from which it derives many of its improvements over the Virtus line, SIG Sauer refers to
171-571: The XM250 Machine gun, to replace the M4 carbine and M249 light machine gun, respectively. The main driving force behind the US Army's wish to upgrade its small arms came from lackluster performance when engaging insurgents abroad. Standard caliber M4 Carbines and M249 light machine guns chambered in 5.56×45mm NATO did not have the firepower to effectively engage in long-range firefights. Also found inadequate
190-560: The handguard of the MCX, which slides off after pulling the front pivot pin, the MCX-MR requires the removal of two screws first. It features both an M16 / AR-15 type charging handle and a left side charging handle. It uses a 20-round magazine and is also compatible with SR-25 lower receivers for use of SR-25 box magazines . The SIG MCX-SPEAR was Sig Sauer's submission for the United States Army Next Generation Squad Weapon (NGSW) program, as chambered in .277 FURY cartridge. Sig Sauer
209-423: The military and law enforcement agencies . SIG Sauer offers the rifle in semi-automatic only in three different configurations for the civilian market: The SIG MCX VIRTUS is the second generation of the SIG MCX series and was introduced in 2017. The SIG MCX RATTLER is a short-barreled rifle variant chambered in .300 AAC Blackout and 5.56 . It is intended to serve as a personal defense weapon , featuring
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#1732858159785228-562: The Ukrainian Armed Forces during the Russian Invasion of Ukraine. A SIG MCX was used in the 2016 Orlando nightclub shooting , which at the time was the deadliest mass shooting in U.S. history , now second to the 2017 Las Vegas 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
247-434: 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. First generation MCX variants have
266-575: The help of an adapter. An integrally suppressed upper receiver group based on the MCX was selected by USSOCOM for the SURG (Suppressed Upper Receiver Group) contract in July 2018. These suppressed uppers would be paired with existing M4A1 lowers in SOCOM inventory. The SIG MCX is available with a safe / semi-automatic trigger group for the U.S. civilian market, or safe/semi-automatic/ fully automatic trigger group for
285-516: The military versions as simply the "MCX LT" or "MCX Lightweight". The defining features of the LT are its new, lightened, handguard and barrel design (borrowed from the SPEAR) ambidextrous bolt catch and release, proprietary SL muzzle device to allow for the use of SIG SAUER's quick detaching SLX and SLH suppressors, and new coyote brown coating (black options are still available for purchase). Intended to serve as
304-559: Was 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 16-inch (410 mm) 416 stainless steel barrel with a 1:10 inch twist rate , which is manufactured by Bartlein Barrels. The gas system features suppressed and unsuppressed settings. Unlike
323-505: Was designed to fire the 6.8×51mm SIG Fury cartridge in response to concerns that improvements in body armor would diminish the effectiveness of common battlefield rounds such as the 5.56×45mm NATO (used in the M4 and M249) and 7.62×51mm NATO. The decision to make the Spear available to the public was criticized by some anti-gun and law enforcement groups. In January 2022, the SIG MCX-SPEAR
342-415: Was released on the civilian market in 3 standard configurations, which includes the 38.3-inch (970 mm), 35-inch (890 mm), and 24.5-inch (620 mm) length versions, with the former two including bipods. Each model starts at an MSRP of $ 4,999 and are non-California compliant. On April 19, 2022, the United States Army awarded a 10-year contract to Sig Sauer to produce the XM7 rifle, along with
361-543: Was the NATO standard 7.62×51mm. The SIG-produced .277 Fury has a much-increased muzzle velocity and allows longer-range shot placement. The SIG MCX Raptor is a short-barreled rifle variant intended to serve as a carbine , featuring an 8-inch (200 mm) barrel and a Picatinny rail tail interface for attaching either a compact buttstock or a folding PCB (pistol contour brace). It is available in .277 SIG FURY , 6.5 Creedmoor and 7.62×51mm NATO . The SIG MCX-MR (Mid Range)
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