This Winchester manufactured late variation rear sight assembly is for the model 100 semi-auto carbine & rifle and is in very good condition with a few dings on the left side of the base. (file photo)
Note: Winchester model 100 semi-auto rifles and carbines with the following serial numbers have been observed with this part: 17438, 17678, 19677, 106996, 137797, 142776, 167715 & A239625
