This Remington manufactured blue finished cover screw nut is for the Nylon 66 semi-auto rimfire rifle and is in very good condition exhibiting a brown patina 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: 2339644, 2380815, 2492224, A2182642,  & A2307966

N.S.N. : (LG) February 1960, (AG) March 1960, (DH) September 1961, (PJ) June 1962, (EJ) October 1962, (RL) November 1964, (KR) May 1968, (PS) June 1969, (RT) November 1970, (CW) April 1972, (AX) March 1973, (OX) July 1973, (LY) February 1974, (AZ) March 1975, (XZ) December 1975, (CZ) April 1975, (DI) September 1976, (XI) December 1976, (BO) January 1977, (EV) October 1979, (RV) November 1979 & (CD) April 1983