This Remington manufactured receiver insert spacer is for the model 512 Sportmaster bolt action rimfire rifle and is in very good condition with light wear. (file photo)

NOTE: Remington model 512 rimfire rifles with the following year/serial number have been observed with the following year/serial number NSN: (CL) April 1942, (OSS) July 1947, (BTT) January 1948, (PZZ) June 1953, (PC) June 1956,  (XF) December 1959 & (PH) June 1961