This Remington manufactured fourth variation hammer and mainspring assembly is for the late model 12-C slide action rimfire rifle in 22 S, L & LR caliber and is in very good condition with light wear. This assembly consists of the fourth variation hammer, hammer pin, mainspring rod and mainspring. (file photo)

Note: Remington model 12 slide action rimfire rifles with the following serial numbers have been observed with this part: 722004 & 728431

12-A: 741138, 802984 & 806842

12-C: 663586 & 789956