The Springfield M1903 is a bolt action rifle chambered in .30-06 Springfield. It was the standard issue service rifle for the American military in World War I, and continued to be used as a sniper rifle into World War I and the Korean and Vietnam Wars. The M1903 is heavily based off of the Mauser action, to the point that Mauser successfully sued Springfield. As a result, during World War I, Springfield was forced to pay Mauser royalties, even though America and Germany were on opposite sides during the war. The M1903 is no longer being made today, but is a heavy presence in the surplus market, both in the original and sporterized configurations.