This Marlin manufactured early variation disconnector stud is for the earlier model 40 Coast to Coast semi-auto rimfire rifle and has the groove to accept the disconnector stud ring (C-clip) and secure the stud to the side plate. This disconnector stud is in very good condition with light wear. (file photo)

Note: Model 40 rimfire rifles with the following years of manufacture and serial numbers have been observed with this part:

1971: 71474846