This Remington manufactured carrier dog pin is for the early model 12 slide action rimfire rifle which uses the first or second variation carrier dog and is in very good condition with light wear.  (file photo)

Measures: .079" x .480" +/-

Note: Remington model 12 takedown slide action rimfire rifles with the following serial numbers have been observed with this part: 351695

12-A: 3867, 30310 & 100823

12-C: 229853, 247236, 303506, 408616, 409187, 597770, 600364 & 640490