All you have to do is install a smoke hand guard and the weight and nose heavy issue of JP is gone , they just run, are accurate, easy to get parts, easy to clean . Have never had I problem from my JP 10 k rounds, the guys at our club with MPX have trouble getting them to run consistently they seem to be ammo sensitive. But when they run do fine , it’s a no brained if you ask me JP
if you want to know for sure just watch someone clean his MPX then a JP .