I have beat on them,, wiggled that slide like crazy, tried about everything to make them go off. now i didn't put a screw in the trigger like that one moron did. but i couldn't make any of then go off.
Some of the pistols now have removable fire control units, the serial number is stamped on unit, not the frame. so you can easily pull the unit out and fit it into another frame made for that unit. Sig has had them for a long time now.