A Sig will still work with a frame crack. Sig will also replace your gun if you have a frame crack. In 1994-95, Sig beefed up the frame as a fix for the few frames that did crack. I haven't heard of a frame crack in newer style Sigs ever since. I know of one 10 yeaar old rental P220 that had over 100,000 rounds through it before it's frame cracked.
P7, now that's a cool gun, works without the extractor!
P7, now that's a cool gun, works without the extractor!