This Remington manufactured rear sight sub-assembly is for the model 512-X Sportmaster bolt action rimfire rifle and is in very good condition with light wear and a few specks of surface rust. The only parts needed to make this sight complete is the rear sight rivet (we have a reproduction available which is sold separately), the windage adjustment screw (which is near impossible to find) and the raised base platform (equally as hard to find). (file photo)