This Remington manufactured 17 1/4" long inner magazine tube assembly is for the model 12-C slide action rimfire rifle in 22 S, L, & LR. This piece is in very good condition with light wear and some light tarnishing to the brass tube.  (file photo)

Note: Remington model 12-C slide action rimfire rifles with the following serial numbers have been observed with this part:

12-C: 303506, 409187, 500140, 597770, 600364, 607712, 640490, 663586 & 722004