This Remington manufactured recoiling chamber is for the model 550-1 semi-auto rimfire rifle and is in very good condition with light wear. (file photo)

Note: Model 550-1 rimfire rifles with the following date codes and years of manufacture have been observed with this part: (DUU) Sept 49, (EUU) Oct. 49, (CWW) Apr. 50, (EWW) October 1950, (RYY) (WXX) August 1951, Nov. 52, (PZZ) June 53, (LB) Feb. 55, (WB) Aug. 55, (XD) Dec. 1957 & (DS) Sept. 1969.