The lips are measuring .382-.387 with a "somewhat" recently calibrated fowler caliper. No bigger than .387 anywhere.
I've got bigger problems anyway, at least I think I do. When I rack the slide it doesn't feel right. Now I have never racked a witness before, but there's an inordinate amount of scraping going on. There is the whole portion that just feels wrong, like mechanically stuff isn't fitted right, or something is hitting where it isn't supposed to. All my other semi autos, once the hammer is back, you can just endless rack the slide without meeting uneven resistances.
And then there's the firing pin (which I started examining because of the firing pin safety, which I thought might be the culprit). When I pull the firing pin safety block out, it's got a groove ground in, and I can reverse the firing pin and it still allows firing. It's just all lousy fit.
Any excitement I had has dissipated. I feel like somebody just dumped their problem on me.
It would be very helpful if somebody racked their witness slide a few times, slowly and told me if there's some rough spots - like mechanically hitting or rubbing on stuff - and if that's normal.
Thanks!