I’ve had this happen with two 17.5 non MOS guns. The trigger bar seems to be the culprit but I can’t figure out why. My 45 MOS is starting to do the same thing. I’m going to put an Apex trigger and connector in it that I have sitting around and run it for awhile. I’m not a big fan of the wide Apex trigger shoe but I want to see if the trigger bar holds up.