The most common problem with the 4516 is failure to feed,face it you can only make a spring that a few inches long so powerfull ,double spring whatever,the slide functions so fast that the mag spring cant keep up , then add that the gun is lighter ,shorter grip etc, the alloy frame guns are worse,1911,4516,whatever make.If you are standing,2 hand hold, concentrating on your grip you can make them function pretty well,then change to bailing out of a car, combat situation ,slightly loose grip ,tired mag spring ,etc and you have a problem, .45 s were meant to be a med to large size pistol not micro or mini. John, hope you are enjoying retirement,take care, Bob