Gun1

I want to get into USPSA competition and am curious as to whether or not a gun's actual receiver/frame eventually cracks after X number of rounds just from shooting? I figured if anyone knows the answer to this it's competitive shooters. I'm wondering in particular 2 aluminum guns, a Sig P226 and a Beretta 92; 2 steel gun, a CZ 75 SP-01 and a Kahr MK9; the polymer guns like a Glock or a Springfield; and I'm also curious to know how the modular Sigs, the P320 and P365, hold up. If pistol receivers do indeed crack or become worn out to the point that they're no longer useful just from normal usage with a high round count, I'm guessing that it's from stress points and from the slide ramming into the frame when cycling. Since the P320 and P365s use a firearm control unit and everything else is replaceable and sold a la carte, I'm wondering how these hold up since the slide rails are part of the firearm control unit. Will the firearm control unit wear out and crack the same or will the grip module take the blunt of the trauma meaning the firearm control unit will last indefinitely? Or if I use an AXG aluminum grip module on the P320 will that take the ramming and pressure hence saving the firearm control unit from wear and tear? Thanks!

Recently I converted my double stacked 1911 to 460 Rowland. However, I've been having a lot of FTF. The problem appears to be specifically the magazine which cannot keep up with the cycling rate of the slide. I've trying double springs and heavy springs, but nothing seems to work. Any suggestions or prior experience would be welcomed.