This Marlin manufactured fifth variation feed throat with three locating studs is for the late Glenfield model 75C semi-auto rimfire rifle which uses the ejector/lifter spring and is in very good condition with light wear. (file photo)
Note: Marlin Glenfield model 75C rimfire rifles with the following year/serial number have been observed with this part:
1980: 20677893
1982: 18422851