I am having a frequent failure to feed the first round off the magazine from slide lock position. Once the pistol is up and cycling everything runs fine. It occurs with all my mags including Wilson, Mecgar and McCormick. At first I thought it might be recoil spring and/or bullet set back problems. But I have now investigated and corrected both and am still having this glitch. Factory ball tends to hang up just as much as factory jhp and my handloads. If I stop and wire brush the ramp and the chamber it seems to help. But what's up with THAT?!? It's supposed to be a 1911, eh? I don't have an exact round count, but it starts showing up as soon as the gun starts getting dirty, maybe a hundred rounds or so. Yeah, I know, not a "real world" concern, but a major pain in the butt during tactical training and competition. I'm getting snide remarks from the Glockophiles. Tips will be much appreciated. Stay safe.