This is a .264 Winchester magnum featherweight barrel. The barrel does not have a date stamp, but the sight ramp style indicates it was manufactured between 1958 and 1963.
Bluing - 95% - This barrel shows minimal bluing loss, with no significant fading or wear of the bluing.
Metal - This barrel is in excellent overall condition. There are no significant scratches, nicks, or other forms of metal damage.
Bore - 6/10 - The borescope shows that the rifling is still clear and strong, but the bore metal shows some signs of erosion.
We use the NRA Modern Gun Condition Standards Grading System for grading part conditions. You can read about it HERE