Modern semi-autos just about always function as designed. Modern parachutes just about always function as designed. That said, I never ever see anyone jump out of a perfectly good airplane wearing only one parachute.

Seriously, any malfunction that will put a revolver out of action, squib, piece breaks/ falls off will likewise put the semi out of action. But, in addition magazine issues and under/ overpowered or wrong shaped amminition play havoc with semi-autos.

In 40 years I have seen, oh, 100 times as many stoppages with semis than with wheel guns. Not saying that all of those put the semi out permanently, but momentarily can be real, real bad if it's the wrong moment. And yes, experts can clear jams 10 times as fast a a neophyte, but zero jams is probably the ideal.

Funniest stoppage I ever saw was a 1911 clone, the owner turned the gun 90 degrees counter clockwise and the takedown pin fell out. It took three people five minutes to find it in tall grass.

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