I watched a guy nuke his 1911 in 40 with a squib back when I started IPSC, the RO didn't catch the squib (we all did) but the shooter tap racked and fired. blew the chamber out of the ejection port, cracked the slide and blew the mag out. He wasn't happy. Bad bruised hands too. Also saw the same with a Glock at the range in 40, shooter was two stalls over from me, I was loading mags, heard the pop, stepped back and didn't have time to say anything as again, this shooter tap racked and BOOM. he had to go the hospital to get plastic out of his hands. But he healed up fine. Gun was a total write off.