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SIG-Sauer M5 (XM5)

Modular Assault Carbine

United States | 2025

"The SIG-Sauer MCX SPEAR was selected by the United States Army to succeed its aging line of M4 assault carbines."

Authored By: Staff Writer | Last Edited: 04/20/2022 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
The MCX-SPEAR serves as the basis of the United States Army's chosen successor to the storied and long-running M4A1 SOPMOD assault carbine line. The MCX family was debuted by SIG in 2015 and includes a complete line-up of related products for even the most discerning AR-15 user. At the core of the design is its inherent modularity which has made it a popular firearm in a market overflowing with solid options. The MCX-SPEAR was an announced expansion of the MCX family tree in January of 2022.

While the SIG MCX-MR (Mid-Range) failed in its bid to cover the Army's "Compact Semi-Automatic Sniper System" (CSASS) program, the MCX-SPEAR was awarded further development (as the "XM5") ahead of others as part of the service's "Next Generation Squad Weapons" (NGSW) program established in 2017/2018. The program seeks to replace the aging stock of Army M4 carbines, M249 SAW machine guns, and M240 Medium Machine Guns (MMGs) and their associated cartridge types to provide a new-generation of warfighters new tools to deal with emerging global threats.

The MCX-SPEAR is a further evolution of the AR-15 and features all-modern qualities including ambidextrous fire controls, a long section of Picatinny rail over the frame / forend, a vented forend, two-stage match trigger, and adjustable / folding shoulder stock (six positions). Internally, the gun uses a short stroke gas piston (2-position adjustable) with rotating bolt and is billed as a multi-caliber automatic weapon, firing the 7.62x51mm NATO, 6.5 Creedmoor, and 277 SIG FURY (commercial 6.8x51mm) cartridges. The barrel can be capped by a suppressor (SIG SLX, which will be standard-issue equipment for the XM5 package) for clandestine operations and the over-frame Picatinny rail can mount various tactical accessories to suit the mission need. The charging handles are set at both the left-side (non-reciprocating) and rear-of-frame (AR-15-style) positions.

Depending on configuration, the MCX-SPEAR has an overall length of 34.1 inches with a barrel measuring 13 inches long. Weight with the magazine inserted is 8.38lb.

Further trials involving the MCX-SPEAR will be conducted by the Army under the "XM5" designation and, it is assumed, it will enter service as the "M5". The SIG product beat out competitors from Beretta, Desert Tech, Fabrique-Nationale, and Textron and will be chambered in the 6.8x51 SIG FURY cartridge.

Final forms of the in-service gun will incorporate a ballistics-calculating Fire Control System (FCS) with integrated laser range-finders, direct-view optics, as well as magnifiers. Vortex Optics was selected to provide this component with its "XM157 NGSW-FC" entry.

Content ©MilitaryFactory.com; No Reproduction Permitted.

April 2022 - The U.S. Army on April 19th, 2022 selected the SIG-Sauer MCX-SPEAR line to succeed its aging line of M4 assault weapons through the Next Generation Squad Weapons program.

The physical qualities of the SIG-Sauer M5 (XM5). Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
866 mm
34.09 in
O/A Length
330 mm
12.99 in
Barrel Length
8.38 lb
3.80 kg
Short-Stroke Gas Piston; Rotating Bolt; Selective-Fire
6.8x51mm SIG FURY
20-round detachable box magazine.
Onboard FCS; Various Optics.
Performance specifications presented assume optimal operating conditions for the SIG-Sauer M5 (XM5). Information presented is strictly for general reference and should not be misconstrued as useful for hardware restoration or operation.
1,700 ft
518.2 m | 566.7 yds
2,900 ft/sec
884 m/sec
Muzzle Velocity
Notable series variants as part of the SIG-Sauer M5 (XM5) Modular Assault Carbine family line.
M5 - U.S. Army in-service designation.
XM5 - Developmental designation.
MCX-SPEAR - Original SIG product model designation.
Global customers who have evaluated and/or operated the SIG-Sauer M5 (XM5). Nations are displayed by flag, each linked to their respective national small arms listing.

Contractor(s): SIG-Sauer, Incorporated - USA
National flag of the United States

[ United States (planned) ]
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Image of the SIG-Sauer M5 (XM5)
Image from official SIG Sauer marketing materials.
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Image of the SIG-Sauer M5 (XM5)
Image from official SIG Sauer marketing materials.
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Image of the SIG-Sauer M5 (XM5)
Image from the United States Army; Public Release.

Design Qualities
Some designs are single-minded in their approach while others offer a more versatile solution to requirements.
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Developments of similar form-and-function, or related, to the SIG-Sauer M5 (XM5) Modular Assault Carbine.
Going Further...
The SIG-Sauer M5 (XM5) Modular Assault Carbine appears in the following collections:
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