This is a .264 Winchester Magnum featherweight barrel. The barrel is undated, but the sight ramp style indicates it was manufactured sometime between the years 1958 and 1963. It is 26" in length.
Bluing - 50% - This barrel shows some significant bluing loss across the top of the barrel as seen in the listing photos.
Metal - Overall, this barrel is in very good condition. There are some very minor scratches in several spots, but no notable nicks or other forms of metal damage.
Bore - 7/10 - The bore shows some very minor signs of wear. The rifling is bright and smooth throughout the length of the barrel, showing minimal signs of use. Borescope verified.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE