This is AN ORIGINAL pin that holds the trigger and sear in place on the Winchester model 1873 lower tang. Up to serial number 28,000 this pin was inside of the receiver (21/32 long). After that the pin changed length (15/64 inches long) and went to the outside of the receiver to serial number 89,000. After that it was changed back to 21/32 and placed on the inside of the receiver until the Forearm of production. If you need the shorter pin you can use a file to take length off of this pin.