Last month, the US Army designated the XM8 and issued a national stock number: NSN 1005-01-737-3402. Featuring an 10″ barrel, the XM8 (bottom carbine) weighs 7.3 lbs versus the 8.3 lbs of the M7 carbine with 13.5″ barrel (top rifle). These weights are weapon only and do not include suppressor and optic.

Developed by SIG SAUER as part of the Product Improvement Effort, it is a carbine version of the M7 Rifle. Along with the M250 Automatic Rifle, these weapons are being issued to the US Army’s close combat forces (think infantry, etc) as part of the Next Generation Squad Weapon program. They are chambered to fire 6.8 x 51mm composite case ammunition.

Although the main changes to the XM8 carbine are the shorter, tapered barrel, it also eliminates the side folding buttstock for a fixed, telescoping stock like the M4, and features a few changes in the upper receiver group to eliminate weight.

Many had anticipated the PIE variant to be designated as the M7A1 but this move falls more in line with the M16 and M4 as distinct weapons. Perhaps we will see an M7A1 yet.

Considering the Carbine has been given an M designation it looks like there’s a good chance that it will be adopted for issue to at least some of the force.

This entry was posted on Monday, March 16th, 2026 at 14:24 and is filed under Army, weapons. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.