Dunno Tony...I've shot alot of rounds out of my pistols and using dirty ammo too, that is Javelina lube and Bullseye and Unique powder, and they still keep on funtioning. I built that 30 Luger upper for the 70 Series Gold Cup and man oh days is the slide tight, in fact racking it back it stays back. After I put some rounds through it, it come around some. Couple this with a too strong recoil spring, a very heavy barrel/slide for caliber, and the anemic target loads I'm firing, it's a wonder it functions at all, but it does. I think is has all to do with ones ability to build and tune 1911's....I LOVE 1911's and I made it my goal to be able to build them right. I wasn't paying some top gunsmith thousands of dollars to do it for me when it was possible to learn how to do it myself alot cheaper and with alot more satisfaction. I'm an experimentor and have shot everything imaginable out of my 1911's, some I don't care to mention. I've been fooling with 1911's since 1970's, so I think I know some about them. I done so by talking to and watching gunsmiths that work on them, read, and buy books about building them.
My Glock 21, without having done anything to it, also feeds anything I've tried in it so far. That impresses me for as much as alot of folks run them down. My semi-auto Tommy gun also feeds EVERYTHING, that's impressive too.
Joe