This Remington manufactured receiver insert sub-assembly is for the model 512 Sportmaster bolt action rimfire rifle and is in very good condition with light wear. The receiver insert sub-assembly consists of the receiver insert, receiver insert spacer, and the receiver insert spacer pin. (file photo)

NOTE: Remington model 512 rimfire rifles with the following date codes and/or serial numbers have been observed with this part: N.S.N. (XK) December 1941, (APP) March 1945, (KSS) May 1947, (DSS) September 1947, (BTT) January 1948, (RB) November 1955, (PC) June 1956,  & (EF) October 1959