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M series

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M series assault rifles were an old family of combat assault rifles used by the United States military in the early parts of the 21st century. They were discontinued and the Stent Security Solutions R series replaced them in service, becoming the service rifle of the U.S. military.[1]

Behind the scenes

  • The M series name has no connection with the model numbers used to designate weapons used by the United States military, beyond having a letter in common. While M (Model) is generally used to designate weapons in service, it does not indicate any common root between weapons and certainly doesn't refer to entire families of weapons. For example, while the M4 happens to share the mechanics of the M16 in general, being a variant, it doesn't share them with the M1 Garand, M9, M11, M14, or the M60.


  1. R91 5.56mm Assault Rifle: "The R Series of combat assault rifles was used reliably following the discontinuation of the M series in the early 21st century. The R series, produced by civilian manufacturer Stent Security Solutions, was made in many models and variations. The variation most common to the DC Wasteland is the R91 full-auto urban assault rifle.
    This rifle was standard issue for the National Guard during urban pacification operations. Fortunately for our purposes, the Nation Guard had been fully deployed around the DC area during the time of the war. As a result, the R91 is readily available for those willing to search. Although nearly two centuries of scavenging has reduced the numbers of working units, the R91 remains a favorite of Slavers and Raiders. This rifle can also often be obtained from legitimate traders and arms dealers.
    Like any firearm, the R91's effectiveness and accuracy can suffer without regular maintenance."