This Remington manufactured rear sight elevation screw retainer is for the Nyon 66 semi-auto rimfire rifle and is in very good condition with light wear. (file photo)

Note: Remington Nylon 66 rimfire rifles with the following date codes and/or serial numbers have been observed with this part: (LG) February 1960, (RL) November 1964, (DN) September 1966, (RN) November 1966, (CW) April 1972, (AX) March 1973, (EY) October 1974 & (DI) September 1976