An ORIGINAL Firing pin stop for 1890 and 1906 and the early model 62 Winchester pump .22 rifles. This goes on the left side of the bolt and keeps the firing pin in place. This part fits both model 1890 or 1906 Winchesters. It is held in place by 2 tiny firing pin stop screws (part number wp60). On late model 62As the firing pin stop is held in by 2 PINS rather than the screws. If you have this set up in your bolt then you need the firing pin stop model 62A, part number wp2-C.
