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

Note: Remington model 512 Sportmaster bolt action rimfire rifles with the following date codes have been observed with this part: (CSS) April 1947, (ATT) March 1948, (LA) February 1954, (PC) June 1956, (XF) December 1959 & (PH) June 1961