This Remington manufactured carrier is for the model 550-1 semi-auto rimfire rifle and is in very good condition exhibiting a grayish brown patina. (file photo)

Note: Model 550-1 rimfire rifles with the following date codes and years of manufacture have been observed with this part: (KUU) May 1949, (DUU) Sept 49, (EUU) Oct. 49, (CWW) Apr. 50, (EWW) October 1950, (WXX) August 1951, (LYY) February 1952, (RYY) Nov. 52, (PZZ) June 53, (LB) Feb. 55, (WB) Aug. 55, (XD) Dec. 57 & (DS) Sept. 69.