This Remington manufactured first variation breech block assembly is for the early model 12 slide action rimfire rifle in 22 S, L & LR caliber and is in very good condition with light wear and some specks of rust staining. This breech block assembly consists of the first variation breech block, flat type (early variation) firing pin assembly and the extractor assembly.  (file photo)

Note: Remington model 12 slide action rimfire rifles with the following serial numbers have been observed with this part:  229853

12-A: 3867, 100823 & 374065

12-C: 408616, 409187, 500140, 597770, 600364 & 607712