This Remington manufactured early variation hammer and mainspring assembly is for the model 121 slide action rimfire rifle in 22 S, L & LR caliber and is in very good condition with light wear. This assembly consists of the early variation hammer, hammer pin, mainspring rod and mainspring. (file photo)

Note: Model 121 rimfire rifles with the following serial numbers have been observed with this part: 8992, 64734, 84045 & 108148.