In over fifty years of shooting semi-autos, rarely, but it has happened. In a situation where you are defending your life and need more than one round or are using a pistol with a magazine disconnect, one time is once too many. Which is why, unless I'm participating in a pistol shooting "game" where a lightening fast mag reload can, perhaps, keep you from losing a point or two, I prefer a magazine brake for serious carrying duties. Unfortunately, aside from CZ (and maybe a few others I'm unaware of), most pistols don't have them and the ones I really like (Third Generation Smiths) have the infernal mag disconnects. Oh well...