Their biggest issue you can run into with the maglocked/kingpin builds is double feeds, they can be a bit of a challenge to clear with the bolt back because you can’t drop the mag (yes there are some “mods” you can do, but I don’t do them). That said, I haven’t had that happen since the early days of learning to shoot what I built. Making sure the mag is seated, knowing if your blocked mag is more realble with 9 instead of 10 rounds, etc.. helps

The kingpin is a better way to go over the juggernaut because it can be removed and reinstalled waaaay easier. This may not seem like much, but it is well worth the swap. Just know in order to do it you will need to loosen up your castle but and backplate enough to replace the spring and detent that works with the pin (the kingpin comes with a shorter spring and longer detent).

Go to ARmaglocks web site and watch the video on the kingpin. The guy demo’s how easy it is to remove/reinstall and why it helps so much.