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Old January 12, 2013, 01:40 AM   #14
Senior Member
Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,758
Those lines in the chamber are so evenly spaced I doubt the steel case ammo could have caused them. Definitely try some of the advised cleaning techniques above but if the lines remain I'd pursue this issue with Colt. I've never seen anything quite like those pictures.
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