During the 2026 Annual Meeting of the Association of the United States Army (AUSA), held on October 12-14, Sig Sauer unveiled the new M-8 rifle for the US Army, chambered in 6.8x51 mm, the new US cartridge developed for the Army under the Next Generation Squad Weapon (NGSW) program.
The weapon was introduced as the XM-8 in spring 2026, although a “lightened” XM-7 had been circulating for some time. It will begin fielding to units toward the end of the year: FY2027 plans call for orders of 14,944 M-8s, with no new orders for the XM-7.
The M-8 is a substantial evolution of the XM-7 (itself originally designated XM-5), modified in response to feedback from field testing. The changes address 2 issues: overall weight, considered excessive compared to the current M-4A1 in 5.56x45 mm, and ammunition capacity. On the first point, the M-8 is about 0.5 kg lighter than the XM-7. In parallel, new 25-round magazines have been developed to replace the XM-7’s 20-round ones. These should not leave soldiers missing the M-4’s 30-round magazines too much, although some operators have nonetheless voiced regrets.
The M-8 also has a shorter barrel than the XM-7, but the exact figure is unclear. Some documents mention a 3.5-inch (8.9 cm) reduction, while others report a drop from 13.5 in (34.3 cm) on the XM-7 to 10.5 in (26.7 cm), a 3-inch (7.6 cm) reduction. Either way, the weapon has been shortened considerably (in the barrel and, to a lesser extent, the suppressor) and slimmed down to save weight, which we fear will affect its service life. At the operators’ request, the folding stock has also been dropped in favor of a fixed one (which keeps its telescopic/adjustable feature), and further weight-saving measures have been introduced.
The US Army’s intentions remain unclear, however. There is no word on the fate of the approximately 50,000 XM-7s already procured and fielded. Their outlook looks bleak, since the M-8 appears set to replace them, rather than the M-4A1s still in service with the Close Combat Force. That suggests end users are not fully satisfied with the XM-7’s performance. The sophisticated XM-157 fire control system, which has proved unreliable, also appears to be at serious risk. It was absent from the M-8s displayed at AUSA.
Moreover, the weapon and its ammunition remain exclusive to the US Army. The US Marine Corps (USMC) and US Special Operations Command (SOCOM) have said they are not interested. Both continue to rely on the M-4A1 or the M-27. One example is SOCOM’s Hypervelocity Cartridge program, which seeks an M-4 family weapon with enhanced performance similar to that required under NGSW.
In short, the doubts this author expressed in the pages of FWMag (see FWMag 10/2022) about the new cartridge and rifle have proved more than justified. Those doubts were far less pronounced for the M-250 machine gun, which, as expected, is experiencing far fewer problems. At this point, further twists cannot be ruled out.
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