This Remington manufactured early variation ejector plunger case screw is for the model 12 slide action rimfire rifle which uses the early variation ejector plunger case assembly that mounts to the face of the butt stock and is in very good condition with light wear.  (file photo)

Note: Remington model 12 slide action rimfire rifles in 22 S, L & LR caliber with the following serial numbers have been observed with this part:

12-A:

12-C: 663586