The Next Generation Squad Weapon (NGSW) program is a United States military program created in 2017 by the U.S. Army to replace the 5.56mm M4 carbine, the M249 SAW light machine gun, and the 7.62mm M240 machine gun, with a common system of 6.8mm cartridges and to develop small arms fire-control systems for the new weapons. [1][2]

The XM250 is the U.S. military designation for the SIG LMG 6.8, a 6.8×51mm (.277 in), gas-operated, belt -fed light machine gun designed by SIG Sauer for the U.S. Army 's Next Generation Squad Weapon Program in 2022 to replace the M249 light machine gun.

NEWINGTON, N.H., (February 2, 2021) – SIG SAUER, Inc. is proud to announce the final delivery of the Next Generation Squad Weapons (NGSW) systems to the U.S. Army, consisting of the revolutionary 6.8x51 hybrid ammunition, the NGSW-AR lightweight belt-fed machine gun, the NGSW-R rifle, and suppressors.

2022年4月24日 · NGSW（Next Generation Squad Weapons），即下一代班组武器的计划，开始于2018年7月，当时美国陆军就决定要用一种6.8mm口径的班组武器，来取代现役的M4卡宾枪和M249轻机枪，当时的NGSW还只有一张潦草的概念图。

2024年3月29日 · U.S. Army soldiers assigned to the 2nd Infantry Brigade Combat Team, 25th Infantry Division, observe a Next-Generation Squad Weapon (NGSW) machine gun with fire control during a Program Executive...

2022年4月23日 · LMG-6.8沿用了MG-338的铝合金机匣和硬化钢材料、软质弹链袋和连接系统、活塞短行程导气系统、后坐力缓冲系统和内部缓冲器，后坐力降到与M4卡宾枪一样的程度。

2021年4月20日 · 该枪发射.277 SIG FURY弹药（6.8×51mm），正在参加美国陆军“下一代班组武器（NGSW）”项目竞标。 为大家示范LMG-68机枪操作的是一位西格绍尔的工程师，看他的胡子很有点大侦探波罗的样子。 首先是可伸缩的枪托，枪托底部有锁定杠杆，控制枪托的伸缩和锁定。 枪托应该有多个锁定档位，以适合不同的使用需求，这是枪托完全收缩状态。 枪托顶部有黑色的部分，应该是电池。 因为NGSW要求枪械有电池盒，通过智能导轨向瞄准镜和附件提供电源。 …

2022年4月19日 · It has announced that SIG Sauer's submission has been selected as the US Army's Next Generation Squad Weapon. SIG will provide the 6.8mm NGSW-rifle and NGSW-Automatic Rifle.

西格-绍尔M250轻机枪又称为西格-绍尔NGSW-AR轻机枪（新一代小队武器）是西格-绍尔公司为美国军队研发的一款轻机枪，口径6.8mm。 西格-绍尔M250轻机枪是西格-绍尔公司为美国军队研发的一款轻机枪，口径6.8mm。

The SIG SAUER NGSW-AR light machine gun, which as of April 19, 2022, was also assigned the official designation XM250 Automatic Rifle, is a lightweight but powerful squad support weapon, intended to replace old M249 SAW machine guns in the Squad Support / Automatic Rifle role within front-line infantry units of US military.