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The M series of weapons was discontinued in favor of the R series in the early 21st century according to the description of the R91 assault rifle in a Citadel terminal in Fallout 3, although this 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.

Known modelsEdit