My wife recently purchased 2 aftermarket magazine extensions for her Glock 43. I don't remember the name of the company. They increase the capacity by two rounds. The magazines themselves are original Glock magazines and have never given us any issues.
I don't want to put the magazines with extensions on them in service until we've had a chance to thoroughly vet them obviously.
So my question is other than putting rounds through the magazine is there anything else we should do to test the reliability? Does rapid fire or doing mag dumps tell you anything about the reliability of the magazine?