The M-1905 Bayonet was adopted by the US military as a knife bayonet for the Model 1903 Rifle after it was determined necessary for the ?modern? trench warfare of the early 1900?s. Once the bayonet was officially adopted, production began at both the Springfield Armory and the Rock Island Arsenal. The Rock Island Arsenal produced just under 1/2 million total bayonets and this low run means originals are scarce today.