XM8 Carbine Rifle

Full Specifications

XM8 Carbine Modular Assault Rifle

The XM8 carbine rifle was developed as a next-generation modular weapon system aimed at replacing the M4 and M16 platforms in U.S. service. Designed for improved reliability, reduced weight, and enhanced ergonomics, the XM8 emerged as part of the U.S. Army’s Objective Individual Combat Weapon program. Although ultimately not adopted, it remains a notable example of modern small arms innovation, emphasizing modularity and adaptability across combat roles.

Manufacturer

The XM8 was developed by Heckler & Koch, a German defense manufacturer, in collaboration with U.S. Army requirements. The design evolved from the G36 platform, incorporating lightweight polymer construction and an integrated optics system. Its modular architecture allowed configuration into carbine, compact, designated marksman, and automatic rifle variants.

Speed and Range

The XM8 fires 5.56×45mm NATO ammunition, delivering a muzzle velocity of approximately 850 m/s. It offers an effective range of around 500 meters, depending on configuration and barrel length. The weapon supports semi-automatic and fully automatic fire modes, with a cyclic rate of approximately 750 rounds per minute.

Cost / Price

As a prototype system, the XM8 did not enter mass production. Estimated unit costs during development ranged between $600 and $1,200 per unit, depending on configuration and accessories. Program cancellation prevented final cost standardization.