Light Weight Firing Pin Extension, Uberti Model 1866, 1873, Old & New Styles
This firing pin extension is made from steel, drilled from the front end to make it hollow, then plugged .
Old and new are pretty easy to determine as most Uberti rifles with a serial number starting with the "W" in it will be the new model. This started happened between 1985-1989. Older models without the "W" will be the "old" model.