I purchased a Rifle barrel [23"] in 17 Mach II on Gunbroker. Barrel looked new in box with no use marks at all. It was tested today at 50' indoor range and shot 1" groups! Inspection of the muzzle shows reamer marks, fairly deep in the rifling about 1/16" inside, obvioiusly a factory defect. I could cut back and properly crown on a lathe but then the barrel would be 'modified'.
I plan on contacting T/C about it before I do anything. What in your experience will they do?