This Remington manufactured early variation straight slot butt plate screw is for the model 550-1 semi-auto rimfire rifle and is in very good condition exhibiting a grayish brown patina with honest wear. (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) Oct. 50, (LXX) February 1951, (WXX) August 1951, (LYY) February 1952, (EYY) Oct. 52, (RYY) Nov. 52 & (PZZ) June 53.