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

Note: Firearms with the following serial numbers have been observed with this part: 3867, 100823, 229853, 374065, 500140, 597770 & 607712.

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