Article · Wikipedia archive · Last revised Jun 7, 2026

M7 rifle

The M7 rifle, previously designated as XM7 and originally as XM5, is the U.S. Army's adopted variant of the SIG MCX-SPEAR chambered in 6.8×51mm Common Cartridge, designed by SIG Sauer for the Next Generation Squad Weapon (NGSW) program in 2022 to replace the M4 carbine.

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M7
U.S. Army 6.8mm rifle, M7 with M157 fire control optic
TypeAssault rifle123
Battle rifle4
Carbine
Place of originUnited States
Service history
In service2022–present
Used byUnited States Army
Production history
Designed2019
ManufacturerSIG Sauer
VariantsSee Variants
Specifications
MassM7: 8.38 lb (3.80 kg)5
9.84 lb (4.46 kg) (with suppressor)6
M7 PIE: 7.6 lb (3.4 kg)7
XM8: 7.3 lb (3.3 kg)8
8.8 lb (4 kg) (with suppressor)8
LengthM7: 36 in (914 mm) (with suppressor)9
XM8: 32.79 in (833 mm) (with suppressor)8
Barrel lengthM7: 13.5 in (343 mm)6
XM8: 11 in (279 mm)8
Cartridge6.8×51mm Common Cartridge (.277 Fury)
ActionShort-stroke gas-operated piston, rotating bolt10
Muzzle velocity915 m/s (3,000 ft/s)10
Feed system20-, 25-round SR-25 pattern magazines111213
References14

The M7 rifle, previously designated as XM7 and originally as XM5, is the U.S. Army's adopted variant of the SIG MCX-SPEAR chambered in 6.8×51mm Common Cartridge (.277 Fury),15 designed by SIG Sauer for the Next Generation Squad Weapon (NGSW) program in 2022 to replace the M4 carbine.

The M7 features a gas-operated system, a free-floating reinforced M-LOK handguard for direct accessory attachment to slotted hole mounting points, and uses SR-25 pattern magazines. It was fielded beginning in March 2024.16

History

In January 2019, the United States Army began the Next Generation Squad Weapon Program to find replacements for the M4 carbine and M249 Squad Automatic Weapon. In September 2019, SIG Sauer submitted its designs.17 The SIG MCX-SPEAR (the rifle's commercial designation) chambered in .277 Fury (later designated as the "6.8 Common Cartridge" after Army acceptance) in response to concerns that improvements in body armor would diminish the effectiveness of calibers such as 5.56×45mm NATO (for the M4A1 and M249 SAW) and 7.62×51mm NATO (for the M240).11819

U.S. Army soldier with an XM7 rifle during a situational training and live-fire exercises at Fort Campbell, 2024 source ↗

In April 2022, the Army awarded a ten-year contract to SIG Sauer to produce the M7 rifle, and the M250 light machine gun, to replace the M4 carbine and M249 Squad Automatic Weapon, respectively.2021 The rifle was originally designated as the XM5, continuing the numerical sequence from the M4 carbine it is set to replace.22 In January 2023, the Army changed the name of the rifle from the XM5 to the XM7, to avoid a trademark conflict with Colt's M5 carbine.23

U.S. Army soldier with an XM7 rifle during the 2025 Best Ranger Competition source ↗

The first batch of 25 XM7 rifles and 15 XM250 light machine guns were planned for delivery in late 2023. The Army may order 107,000 rifles and 13,000 light machine guns over the next decade for close combat forces, including infantry, cavalry scouts, combat engineers, forward observers, and combat medics. There are no current plans to issue the XM7 and XM250 to non-close combat soldiers. The contract does have the option to build additional XM7 rifles and XM250 light machine guns should the U.S. Marine Corps and U.S. Special Operations Command choose to be included in the adoption.22

In September 2023, XM7 rifles were delivered to the 101st Airborne Division and 75th Ranger Regiment for user tests.24 Operational testing of the XM7 rifle, XM250 light machine gun, and XM157 Fire Control Optic was scheduled to begin in 2024,23 but widespread distribution was not assured.25 In March 2024, 1st Battalion, 506th Infantry Regiment of the 101st Airborne Division began fielding the XM7.16 In January 2026, the U.S. Army's 25th Infantry Division were trained with the M7 rifle.26

In May 2025, the XM7 was type classified as the M7 rifle. The Type Classification confirms the system meets the U.S. Army's stringent standards for operational performance, safety, and sustainment.2728

In September 2025, SIG Sauer introduced an improved carbine variant of the M7 rifle. The U.S. Army decided to proceed with the procurement of the M7 carbine design in December 2025, designating it as the XM8 carbine.29

Design details

U.S. Army infantryman firing an M7 rifle with a Vortex "Eleanor" AMG 1-10×24 LPVO and a B.E. Meyers MAWL laser aiming module, 2026 source ↗

The M7 was developed for the 6.8×51mm Common Cartridge, offering greater lethality at longer ranges.30 To fully utilize its capabilities, it is paired with the M157 Fire Control optic, which integrates a laser rangefinder, ballistic calculator, and other technologies to increase accuracy.31 The M7 is the first U.S. Army service rifle to be issued with a suppressor as standard to reduce its firing signature.32 The original suppressor was 7 in (180 mm) long and weighed 1.46 lb (0.66 kg).33

The rifle weighs 8.38 lb (3.80 kg), or 9.84 lb (4.46 kg) with a suppressor. It uses SR-25 pattern magazines that hold either 20 or 25 rounds in a detachable box magazine.1112 The proposed combat ammunition load for each soldier will be 140 total rounds in seven 20-round magazines, in total weighing 9.8 lb (4.4 kg).534

Compared to the M4A1 carbine weighing 6.34 lb (2.88 kg) unsuppressed, with a basic combat load of 210 rounds in seven 30-round magazines, in total weighing 7.4 lb (3.4 kg), the M7 rifle weighs about 2 lb (0.91 kg) more. Each soldier carries roughly a 4 lb (1.8 kg) heavier load with 70 fewer rounds.534

Variants

M7 rifle with an EOTech EXPS3 with G33 magnifier and an Envision RAIL laser aiming module source ↗

In October 2025, SIG Sauer displayed the (Product Improvement Effort) PIE M7 and M7 carbine at the Association of the United States Army (AUSA) Annual Meeting & Exposition. The PIE M7 variant has a 13.5 in (340 mm) barrel and has been lightened by approximately 0.7 lb (0.32 kg), from roughly 8.3 lb (3.8 kg) to about 7.6 lb (3.4 kg). The M7 carbine variant has a 10 in (250 mm) barrel and weighed about 7.3 lb (3.3 kg). These weights are reported as baseline figures, excluding any optical sight or suppressor. The weight reduction was achieved through a redesigned upper receiver, a slimmer barrel profile, lighter internal components, and removal of the folding stock hinge.3536

The SLX suppressor was also shortened and paired with a new lightweight thermal shield, which delays the visible heat signature under night-vision and thermal optics until after roughly 100 rounds, rather than about 40 rounds without the thermal shield.37

U.S. Army officials are reviewing whether to field the standard-length PIE M7, adopt the shorter carbine variant as the new standard, or issue different configurations to different unit types.3536

XM8 carbine

XM8 carbine with a fixed stock and improved SLX suppressor source ↗

SIG Sauer presented an improved carbine variant of the M7 rifle at Defence and Security Equipment International (DSEI) 2025. It is lighter and more compact than the original design, with a reported 10.5-inch barrel instead of 13.5 inches, lightened internal parts, and a reprofiled handguard. It weighs about 7.5 lb (3.4 kg) unloaded, without an optical sight but with a suppressor, compared to about 9.84 lb (4.46 kg) for the original M7. SIG Sauer reported that muzzle velocity with the shorter barrel is about 2,800–2,900 feet per second, a slight reduction from roughly 3,000 feet per second.37 The M7 carbine variant was later designated as the XM8 carbine, which is unrelated to the Heckler & Koch XM8. In April 2026, the U.S. Army accepted the first delivery of XM8 carbines from Sig Sauer.38

XM8 carbine demonstrated during familiarization training, 2026 source ↗

The XM8 carbine is a shortened and improved variant of the M7 rifle developed under the Next Generation Squad Weapons program. The carbine variant was introduced in response to soldier feedback calling for a lighter and more maneuverable rifle. The XM8 is designed to improve mobility and adaptability across different operational environments while maintaining the performance and reliability standards of the M7 platform.

The XM8 has a barrel length of 11 in (280 mm) and an overall length of approximately 32.79 in (833 mm) with the stock collapsed and suppressor attached. It weighs about 7.3 lb (3.3 kg) unloaded and 8.8 lb (4 kg) with the improved suppressor.8 Compared to the standard M7 rifle, the XM8 is approximately 3.5 in (89 mm) shorter and more than 1 lb (0.45 kg) lighter, with the same weight as an M4A1 carbine. It is supported by ongoing NGSW product improvements, including the introduction of 25-round magazines as standard, lighter ammunition to increase soldier load capacity, a redesigned suppressor with heat shield that has a reduced length of 6 in (150 mm) and weighs 1.31 lb (0.59 kg),33 alternate optics, and enhancements to the M157 fire control system to create target reference points and request for fire support with greater precision.2913

  • U.S. Army infantryman with an M7 rifle
    U.S. Army infantryman with an M7 rifle
  • U.S. Army infantryman firing an M7 rifle
    U.S. Army infantryman firing an M7 rifle
  • U.S. Army infantryman firing an M7 rifle with M157 fire control optic
    U.S. Army infantryman firing an M7 rifle with M157 fire control optic
  • U.S. Army infantryman training with an M7 rifle at Schofield Barracks
    U.S. Army infantryman training with an M7 rifle at Schofield Barracks
  • U.S. Army infantryman firing an M7 rifle during a weapon qualification
    U.S. Army infantryman firing an M7 rifle during a weapon qualification

Users

See also

See also

References

References

  1. South, Todd (19 April 2022). "Army chooses Sig Sauer to build its Next Generation Squad Weapon". Army Times. Archived from the original on 28 March 2026. Retrieved 20 April 2022.
  2. Baca, Nathan (18 July 2022). "The US Army's new assault rifle coming to local gun stores". WUSA. Retrieved 17 February 2024.
  3. Suciu, Peter (9 May 2025). "The U.S. Military's New XM7 Assault Rifle Might Be a Dud". The National Interest. Retrieved 1 October 2025.
  4. "Defense Rifles Spear". www.sigsauer.com. Retrieved 3 April 2026.
  5. Beynon, Steve (2 May 2022). "How Well Do the Army's New Guns Perform? That's Classified, But Soldiers Will Carry More Weight, Less Ammo". Military.com. Archived from the original on 30 May 2022.
  6. Moss, Matthew (16 May 2022). "US Army Shares Details on Next Generation Squad Weapons". The Firearm Blog. Archived from the original on 18 May 2022.
  7. TAB (14 October 2025). "AUSA 25 – SIG SAUER Displays Lighter NGSW Product Improvement Effort Weapons". soldiersystems. Retrieved 7 December 2025.
  8. Capability Program Executive - Ground (26 March 2026). "XM8 Carbine". cpeground.army.mil. Archived from the original on 26 March 2026. Retrieved 26 March 2026.
  9. "The Next Generation Has Arrived". SIG Sauer. 19 January 2022. Archived from the original on 19 February 2023. Retrieved 20 February 2023.
  10. Popenker, Maxim. "SIG Sauer NGSW-R MCX Spear XM5 assault rifle (USA)". Modern Firearms. Archived from the original on 4 June 2022.
  11. "LANCER SYSTEMS L6SCM – Lancer Systems". Lancer Systems. Archived from the original on 15 April 2023. Retrieved 1 May 2023.
  12. "The Sig Sauer M5 NGSW Rifle a/k/a The MCX Spear". The Firearm Blog. Archived from the original on 10 May 2023. Retrieved 9 August 2023 – via Youtube.com. We are running 20- and 25-round 6.8×51mm Lancers in the MCX-SPEAR currently, but any Magpul, 7.62mm NATO magazines interfaces with it
  13. C, Josh (19 March 2026). "Army Testing Shorter, Lighter XM8 Carbine (Revised)". thefirearmblog.com. Retrieved 28 March 2026.
  14. "Justification Book - Procurement of Weapons and Tracked Combat Vehicles" (PDF). www.asafm.army.mil. Archived from the original (PDF) on 3 October 2025. Retrieved 28 November 2025.
  15. ".277 Sig Fury (6.8x51) | Complete Guide and Comparisons". www.bearcreekarsenal.com. Retrieved 28 September 2025.
  16. Lehrfeld, Jonathan (29 March 2024). "101st Airborne first Army unit to field Next Generation Squad Weapons". Army Times. Retrieved 4 June 2024.
  17. Moss, Matthew (19 April 2022). "SIG Sauer Wins US Army Next Generation Squad Weapon Contract". Overt Defense. Archived from the original on 20 April 2022. Retrieved 20 April 2022.
  18. Schogol, Jeff (19 April 2022). "Army selects Sig Sauer to produce Next Generation Squad Weapon and ammo". Task & Purpose. Archived from the original on 31 May 2022. Retrieved 20 April 2022.
  19. Mizokami, Kyle (21 April 2022). "The Army's Next-Gen Infantry Weapons Will Be More Lethal and More Accurate". Popular Mechanics. Archived from the original on 31 May 2022. Retrieved 24 April 2022.
  20. Beynon, Steve (19 April 2022). "Army Picks Its Replacement for the M4 and SAW". Military.com. Archived from the original on 20 May 2022. Retrieved 20 April 2022.
  21. "Army awards Next Generation Squad Weapon contract". U.S. Army. 19 April 2022. Archived from the original on 31 May 2022.
  22. Smith, Todd (20 April 2022). "Army expects Next Generation Squad Weapon to get to its first unit by next year". Army Times. Archived from the original on 28 March 2026. Retrieved 29 May 2022.
  23. South, Todd (18 January 2023). "New name selected for Army's Next Generation Squad Weapon". ArmyToday.com. Retrieved 3 June 2024.
  24. South, Todd (20 December 2023). "Army to field new rifle, machine gun and optic in 2024". Army Times. Archived from the original on 28 March 2026.
  25. Parsons, Dan (20 April 2022). "Here's Everything We Now Know About The Army's New Squad Rifles". The Drive. Archived from the original on 30 May 2022. Retrieved 30 April 2022.
  26. "USAMU Builds Lethality During M7 Fielding with 25th Infantry Division". www.army.mil. Retrieved 31 January 2026.
  27. "SIG SAUER Announces U.S. Army Designates Type Classification Milestone for the NGSW Lethality Program". Fox40 News, 20 May 2025.
  28. Project Manager Soldier Lethality Announces Type Classification Approval for Next Generation Squad Weapons (NGSW). Army.mil. 20 May 2025.
  29. CPE Ground Army (26 March 2026). "Army Approves XM8 Carbine". cpeground.army.mil. Archived from the original on 26 March 2026. Retrieved 26 March 2026.
  30. "Army awards Next Generation Squad Weapon contract". www.army.mil. 19 April 2022. Retrieved 31 March 2026.
  31. Army finally picks an optic for Next Generation Squad Weapon. Army Times. 7 January 2022.
  32. TAB (6 May 2022). "NGSW: The US Army's First Suppressed Service Rifle & Some History". The Armourers Bench. Retrieved 31 March 2026.
  33. Trevithick, Joseph (23 March 2026). "New Army 6.8mm Carbine Recycles XM8 Designation From Failed "Starship Troopers" Rifle Program". The War Zone. Retrieved 31 March 2026.
  34. Reinsch, Michael (13 May 2022). "NGSW signifies an evolution in Soldier lethality". U.S. Army. Archived from the original on 16 July 2022.
  35. Altman, Howard; Trevithick, Joseph (13 October 2025). "Sig Sauer's M7 Rifle For The Army Is Now Lighter After Controversy". The War Zone. Retrieved 15 October 2025.
  36. South, Todd (14 October 2025). "Next Generation Squad Weapon continues fielding, seeing upgrades". Army Times. Retrieved 15 October 2025.
  37. "Hands On With SIG Sauer's Improved M7 Rifle". The Armourers Bench. 21 September 2025. Retrieved 21 September 2025.
  38. CPE Ground Army (3 April 2026). "U.S. Army Announces XM8 Carbine Delivery Order". cpeground.army.mil. Capability Program Executive - Ground. Archived from the original on 8 April 2026. Retrieved 8 April 2026.
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