M series

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.

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.