This is a .22 Hornet standard barrel from a 1937 Model 70 rifle. It has been rechambered to .22 Kilbourn.
Bluing - 95% - The bluing on this barrel shows minimal signs of wear.
Metal - Overall, this barrel is in very goodcondition. There are a few very minor nicks and scratches but no other marks of metal damage.
Bore - 7/10 - The bore shows somesigns of wear. The rifling is still bright and smooth and looks perfect to the naked eye, but the borescope found some spots of light pitting scattered throughout the length of the bore. Borescope verified.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE