This Remington manufactured second variation "L" shaped carrier dog is for the model 12 slide action rimfire rifle in 22 S, L, & LR caliber and is in very good condition with light wear.  (file photo)

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

12-A: 374065

12-C: 229853, 247236, 303506, 408616, 409187, 500140, 597770, 600364, 607712 & 640490