Sig Sauer’s M250 Machine Gun Gets Shorter And Lighter After Army Feedback

Army feedback produced a lighter, shorter, and more adaptable M250A1. Sig Sauer shortened the barrel to 13 inches, reduced the gun’s overall weight, changed the buttstock, and made other changes aimed at reliability and easier use. The goal was to address concerns about the weapon’s bulk while preserving its required performance.

The barrel was not merely cut shorter. Sig Sauer tapered it to save additional weight. The company also adjusted parts so they could be manufactured more easily and potentially become more reliable or durable. The M250A1 can still use a 16-inch barrel, making the weapon mission-configurable.

The Army is already fielding baseline M250s, so these changes reflect feedback from soldiers using the weapons. Sig’s Jason St. John said soldier touchpoint events provide direct field input. The redesign follows a similar effort to make the M7 rifle shorter and lighter before the M8 carbine emerged.

The M250 is a 6.8x51mm light machine gun made by Sig Sauer for the U.S. Army. It belongs to the Next Generation Squad Weapons, or NGSW, family. The Army is acquiring it as a replacement for a substantial portion of its existing M249 Squad Automatic Weapons, alongside replacements for some M4A1 carbines.

A light machine gun gives an infantry squad a portable source of automatic fire. Its job is to help suppress threats and support soldiers moving or holding ground. Compared with heavier crew-served guns, it is designed to remain usable by troops within the squad. The article specifically identifies the M249 SAW as the M250’s predecessor in Army fielding plans.

The Army is still in the early stages of introducing the M250. Baseline guns are already being acquired and fielded, while the improved M250A1 is being shown with a shorter barrel and reduced weight. Soldier feedback is shaping the weapon as operational experience grows.

The M250A1 introduces a 13-inch barrel alongside the 16-inch barrel the Army is also buying. That gives soldiers or units a shorter option for maneuverability without abandoning the longer configuration intended to meet the Army’s lethality requirement. The baseline M250 entering service has a barrel of roughly 16 inches.

The Army’s official fact sheet originally said the machine gun was expected to have a 17.5-inch barrel. Compared with that figure, the baseline is about 1.5 inches shorter, while the new 13-inch option is 4.5 inches shorter. Sig Sauer also tapered the 13-inch barrel to reduce weight.

The two M250A1 barrel lengths make the system mission-configurable, according to Sig’s Jason St. John. The 13-inch barrel is intended to offer handling benefits and ballistics similar to the M7’s 13-inch barrel. The 16-inch barrel preserves the longer configuration originally required for lethality.

Shortening and lightening a machine gun can reduce the physical burden on soldiers. A shorter weapon is easier to maneuver around buildings, vegetation, vehicles, and other obstacles. Lower weight can also make it easier to carry, bring onto a target, and control during movement. These advantages matter for a weapon that must accompany infantry.

The M250A1 shows this approach through its 13-inch barrel and tapered profile. Sig Sauer said the shorter barrel creates more maneuverability, while tapering saves additional weight. The company also reduced overall weight and changed the buttstock. Together, these changes address concerns about the original system’s weight and bulk.

The Army is not limited to the shorter setup. It is also buying a 16-inch barrel, so the weapon can be configured for different missions. This flexibility mirrors the M7’s evolution, where shortening and lightening preceded the M8 carbine’s adoption as the compact option.

A shorter barrel generally gives a bullet less time and distance to gain speed from expanding propellant gases. Lower velocity can reduce a projectile’s reach and performance, especially at longer distances. Sig Sauer acknowledged that the 13-inch M250A1 barrel would lose velocity compared with the longer barrel. The ammunition itself was not changed.

Despite that tradeoff, the Army determined the shorter barrel still met its ballistic and lethality goals. Sig’s Jason St. John said the 13-inch setup maintains the same basic ballistics as the M7 rifle’s 13-inch barrel. The Army therefore accepted some velocity loss in exchange for a shorter weapon with better maneuverability.

The cartridge and weapon could potentially gain more performance later through higher pressure, St. John said, but that was not necessary for the current requirement. The Army is also buying 16-inch barrels, preserving a longer option for missions needing the originally required barrel length.

The M250 sits within the Army’s Next Generation Squad Weapons program. Sig Sauer won the NGSW competition in 2022. The program is replacing a substantial portion of the Army’s existing 5.56x45mm M4A1 carbines and M249 Squad Automatic Weapons. The M250 fills the light-machine-gun role in that broader family.

The M7 rifle and M8 carbine are the family’s individual-weapon members. Both are made by Sig Sauer and, like the M250, are chambered for the 6.8x51mm round. The M8 emerged after the M7 became progressively shorter and lighter, including through barrel reprofiling. Its 10-inch barrel makes it close to one pound lighter than the 13-inch M7.

Fielding remains in its early stages. The Army is already acquiring and issuing baseline M250s, while the M250A1 reflects continuing soldier feedback. The system can use 13-inch or 16-inch barrels, adding configuration flexibility as the program develops.

A cartridge’s pressure provides the force that drives a bullet down the barrel. A longer barrel can let expanding gases act on the bullet for more time, often increasing velocity. Higher velocity can support greater range and impact performance. Barrel length, pressure, bullet design, and the Army’s required effects therefore work together rather than independently.

The article gives a specific M250 example. Current 6.8x51mm ammunition operates in the mid-70,000 pounds-per-square-inch range, while the case has 125,000-psi potential, according to Sig’s Jason St. John. He said raising pressure could help recover performance if a shorter barrel created lethality concerns.

The Army did not make that change. It decided the existing ammunition and 13-inch barrel met its ballistic and lethality goals. The M250A1 therefore gains maneuverability without a new cartridge. The article says future battlefield needs could still lead the weapon and ammunition to grow in performance capacity.