Sorry, I had to make sure what parts I had and wanted to make sure I had the right letters after the serial numbers. To start over, I had recieved some guns from my wife's late Uncle's estate. Also included we found some firearm parts that I searched on the internet and determined they were for a M1 Garand. The parts included some operating rods and a few complete triggers. The triggers have a SA stamped on them after a "part number"? After researching I believe thosewere made bySpringfield Armory. One of the triggers has a WMA after the numbers. I think that means Winchester. I think there were a few makers of the M1 over the years. Anyone know for sure? Also anyone know what these may be worth? Thanks!