This Marlin manufactured sixth variation feed throat with four raised circular studs (2 on the left and 2 on the right) is for the model 60 semi-auto rimfire rifle which uses the ejector/lifter spring and is in very good condition with light wear. (file photo)
Note: Marlin model 60 rimfire rifles with the following year/serial numbers have been observed with this part:
2002: 98462213