The M1A is a civilian version of the M14 rifle designed and manufactured by Springfield Armory, Inc. in 1974. The term "M1A" is a proprietary title for Springfield Armory's M14 pattern rifle. Early M1A rifles were built with surplus G.I. parts until Springfield Armory, Inc. began manufacturing their own.
Firearm Manuals Springfield Armory M1A Manual 2013-09-10
User manual for the M1A Rifle