M199 assault rifle

Perhaps the most well-recognized weapon in the pre-War U.S. Military arsenal, the M199 earned its nickname "The Backtalker" from the unusual report the firing mechanism makes as it ejects a spent shell. Firing standard 5.56mm rounds, the M199 was the official infantry weapon of the U.S. Army and part of the M Series of weapons.

Though no images of the M199 have appeared in any Fallout game it is possible that the M199 is a full auto version of the NCR Main Battle Rifle the [[Service Rifle []]]. The evidence to support this comes from Fallout New Vegas - Honest Hearts, In this DLC pack you find the Survivalist Rifle which is a 12.7mm Variant of the Service Rifle. This Rifle was originally a U.S. checkpoint guard carbine used in Canada, issued from the Long Branch Arsenal in Toronto, Ontario, USA territory. Chambered with the 12.7mm round, this rifle was supposed to offer guards the firepower necessary to intercept anyone attempting to breach a checkpoint, regardless of equipment. The Idea that the Survivalist Rifle is a variant of the M199 is supported by the fact that the majority of modern militaries only create variants of there Main Battle Rifle, an example is the M-16 which was developed in to the M-4 and then in to a variety of variants such as the SR-25 Sniper Rifle, in addition to this developing an existing weapon platform in to new variants conserves resources which was one of the cornerstone of the US war effort during the Resource Wars with Communist China.

Appearances
The M199 doesn't technically appear in any game, and is mentioned in the Museum of Technology in Fallout 3. In the game itself, the default assault rifle model is the R91 assault rifle, a weapon used by the National Guard.

Inconsistency
The description of the R91 assault rifle in a Citadel terminal states that the M series was discontinued in favor of the R series in the early 21st century, which contradicts the information in the Museum of Technology about the M199 still being the official U.S. Army weapon (stated in present tense). It is a possibility that the museum's exhibit was in place before the military made the decision.

Штурмовая винтовка М199