My pistol is a Colt 1911 commercial model manufactured in 1918, so it has a few miles on. I shoot factory hardball always. The problem is that the slide sometimes binds up for no apparent reason. Magazine in or out makes no difference. Only happens when the slide is racked by hand. I think it has something to do with the slide stop. There is some peening on the slide at the stop notch and at the other little notch behind it. I am considering stoning the slide stop corners to round them a little. They are pretty squared off. My other pistol's slide stop (systema) has a more rounded shape. Any of you guys had this happen to you and do you have any wisdom for me?