This Remington manufactured second variation 24" long barrel with the later style barrel markings is for the model 550-1 semi-auto rimfire rifle in 22 S, L & LR caliber and is in very good condition exhibiting a mixture of original blue finish with a brownish gray patina and possibly having a few specks of surface rust. The bore is bright and rates excellent. (file photo)

Note: Remington model 550-1 rimfire rifles with the following date codes and years of manufacture have been observed with this part: (LB) Feb. 55, (WB) Aug. 55, (XD) Dec. 57, (CF) April 59 & (DS) Sept. 69.