This Remington manufactured late variation outer magazine tube with the cartridge shaped loading port is for the late model 550-1 semi-auto rimfire rifle and is in very good condition exhibiting a mixture of original blue finish with a brown patina and light wear. (file photos)

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, (LXX) February 1951, (WXX) August 1951, (LYY) February 1952, (RYY) Nov. 52, (PZZ) June 53, (LB) Feb. 55, (WB) Aug. 55, (XD) Dec. 57 & (DS) Sept 69.