This Remington manufactured late variation rear sight windage screw with the small head is for the Remington Nylon 66 semi-auto rimfire rifle and is in excellent condition overall. (file photo)

Note: Remington Nylon 66 rimfire rifles with the following serial numbers have been observed with this part: NSN (pre-68)

(RL) November 1964, (DN) September 1966, (RN) November 1966, (CW) April 1972, (AX) March 1973, (EY) October 1974 & (DI) September 1976