What happened to the Army’s M-16 replacement rifle?

​

The US military has long explored the idea of replacing its M-16 assault rifle with something newer and deadlier. From the 1990s onward, German arms giant, Heckler & Koch, was heavily involved in helping the US Army attempt to reach that objective, creating newfangled firearms that bear considerable resemblances to the guns you’d find in futuristic, sci-fi movies and TV shows.

The XM8 was one of these rifles developed by H&K in the early 2000s as one of a number of alternatives to the M-16 and its derivative M4 carbine. Born as a scaled-down replacement for another H&K prototype — the XM29 — the XM8 entered a limited production run in 2003, concluding just two years later.

Like the M-16 and M4 platforms, the XM8 also utilized the 5.56 x 45 mm NATO round. Built as a modular weapon and based on the G-36 rifle, then in use with the German military, soldiers could adapt their XM8s while in the field to serve in a variety of roles.

A barrel swap and changing the stock could quickly take the XM8 from its carbine variant to a smaller personal defense weapon, similar in size to an MP5 submachine gun. An XM320 (now the M320, the Army’s standard-issue grenade launcher) could be mounted to the weapon with considerable ease for added firepower.

If a platoon out in the field needed a ranged weapon, the XM8 could be retooled accordingly by simply exchanging the barrel for a longer one, adding a more powerful scope, and a collapsible bipod. Should the situation and scenario call for something with more sustained rates of fire, the XM8 could even be turned into a light machine gun with a rate of fire between 600 to 750 rounds per minute.

To top it off, the XM8 wasn’t just light and extremely versatile, it was also cheaper to produce than the M4 carbine — the rifle it was designed to supplant. Proven to be fairly reliable during “dust tests,” even when compared against the M4, the XM8 was, on the surface, the ideal replacement rifle.

In fact, in the latter stages of the XM8 program, even the Marine Corps demonstrated an interest in testing and potentially buying the new rifle. Should the Department of Defense have picked it up, the gun would have been produced entirely in Georgia, in cooperation with other brand-name defense contractors.