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SIG-Sauer M250 (XM250)

Squad Automatic Weapon (SAW) / Light Machine Gun (LMG) [ 2025 ]

The SIG-Sauer M250 is set to replace the decades-old M249 SAW in the squad-level fire support role with the U.S. Army.

Authored By: Staff Writer | Last Edited: 04/20/2022 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

The SIG-Sauer LMG-6.8 has been selected by the United States Army to succeed its aging stock of M249 Squad Automatic Weapons (SAWs). The selection comes as the service has also moved to adopt the SIG-Sauer MCX-based MCX-SPEAR modular assault weapon to follow the M4A1 under the "Next Generation Squad Weapon" (NGSW) program. Both are to be chambered around the new 6.8x51mm SIG FURY cartridge promising more penetration at-range over that of the in-service 5.56mm cartridge, particularly against body-armored targets.

The original SIG MCX (detailed elsewhere on this site) line debuted in 2015 and encompasses a variety of automatic weapons all centered on high modularity in the familiar, modern AR-15-style framework.

Into 2022, the M249 SAW Light Machine Gun (LMG) continues to serve in the inventory of the U.S. Army and represents the Americanized version of the Belgian FN "Minimi" (detailed elsewhere on this site) in 5.56mm. The type was adopted in the 1980s and saw first combat use in the Invasion of Panama - eventually proving its worth in both major and minor engagements of the last thirty-plus years with American forces. The NGSW program has sought to replace the M4 Carbine, M249 SAW, and M240 Medium Machine Gun (MMG) currently in the Army inventory and offer replacements integrated a complete Fire Control System (FCS) while centering the trio of weapons around the heftier, man-stopping 6.8mm cartridge.

Following further testing of the LMG-6.8 under the developmental "XM250" designation, the weapon will enter service as the M249s direct replacement under the "M250" designation where it will take-over the squad fire support role alongside the M5 modular assault weapon.

The LMG-6.8 will rely on the company's patented SIG 6.8x51 FURY Hybrid Ammunition cartridge which utilizes a lightweight metallic case for higher pressures at play, in turn delivering higher-velocity rounds presumably with greater accuracy at-range.

In the LMG arrangement, the XM250 is a belt-fed system feeding from an under-frame soft case, the belts entering the frame from the left side and exiting from the right. The gun's arrangement is still very conventional with underslung pistol grip / trigger unit, extended barrel assembly, and solid shoulder stock while the internal action is of the proven gas operation. A full-length section of Picatinny rail is seated over the frame for the mounting of various tactical accessories and a suppressor is set to be part of the standard-issue kit for the complete weapon system. Like the XM5, the XM250 will feature an adjustable and folding shoulder support. A hinged, folding bipod will be affixed along the length of the gas cylinder assembly as a forward support. Heat dissipation is aided by a heavily perforated forend.

The XM5/M5 modular assault weapon system features many of these same traits in a lighter, more transportable form and both are set to evolve the Army's tool kit for generations to come.©MilitaryFactory.com
Note: The above text is EXCLUSIVE to the site www.MilitaryFactory.com. It is the product of many hours of research and work made possible with the help of contributors, veterans, insiders, and topic specialists. If you happen upon this text anywhere else on the internet or in print, please let us know at MilitaryFactory AT gmail DOT com so that we may take appropriate action against the offender / offending site and continue to protect this original work.

April 2022 - The U.S. Army on April 19th, 2022 selected the SIG-Sauer MCX LMG-6.8 LMG model to succeed its aging line of M249 SAW through the Next Generation Squad Weapons program.



Service Year

United States national flag graphic
United States


Squad Automatic Weapon (SAW) / Light Machine Gun (LMG)

SIG-Sauer, Incorporated - USA
(View other Arms-Related Manufacturers)
National flag of the United States United States (planned)
(OPERATORS list includes past, present, and future operators when applicable)
Fire Support
Capable of suppressing enemy elements at range through direct or in-direct fire.
Special Forces
Qualities of this weapon have shown its value to Special Forces elements requiring a versatile, reliable solution for the rigors of special assignments.
This weapon is either inherently silent/suppressed or can be made so through special assembly added at the muzzle, specialized subsonic ammunition or a combination of both.

Despite its size / weight, the product can be transported by foot infantry.
Inherent ability to provide suppression capabilities against target / target area.
Supports silenced / suppressed actions - by way of silencer, suppressor, or subsonic ammunition - for clandestine operations.
Internal action allows release of multiple rounds with a trigger pull in quick succession.
An automatic, or pseudo-automatic, function is built into the system, allowing for repeat firing to be achieved.
Supports mounting of optics (scopes) to aid in accuracy for ranged fire.
Aiming can be aided by use of a bipod support assembly, either as an integral part of design or option.
Design allows for user adjustability of certain components for customization.
Design offers mounting points for external, after-market hardware including laser aimers, flashlights, scopes, and grips.

Overall Length
1,045 mm
41.14 in
Barrel Length
465 mm
18.31 in
Empty Wgt
16.20 lb
7.35 kg

Onboard FCS; Various Optics.


Gas-Operated; Full-Automatic Fire Only.

Rounds are automatically ejected from the breech, a new cartridge stripped from the feed and set in the chamber, and rounds are continuously fired so long as the trigger is pulled and an ammunition supply exists.
Gas-operated system is featured, typically involving a gas cylinder and rear-driven piston directing energy to the bolt component.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


6.8x51mm SIG FURY

Rounds / Feed

50-round disintegrating belt.
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Max Eff.Range
2,500 ft
(762 m | 833 yd)
Muzzle Velocity
3,000 ft/sec
(914 m/sec)

M250 - Base Series Designation (U.S. Army).
XM250 - Developmental designation.

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Images Gallery

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Image of the SIG-Sauer M250 (XM250)
Image from the United States Army; Public Release.
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Image of the SIG-Sauer M250 (XM250)
Image from official SIG-Sauer marketing materials.


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