Why is it that just about all the used Sigs I encounter, including my recently purchased 226, have so much wear on the outside of the barrel?I've never seen any other brand of firearm that has so much finish worn off the barrel. Does Sig have tighter tolerances? Other brands have the same locking mechanism but you don't see near as much finish wear on top and bottom of the barrel. Wanna kill these ads? We can help!