since my SA seems to be doing the same song and dance I did some investigation .....
lo and behold dude .. I think I found her sins.
the chamber hood seems to be key to maintaining barrel alignment at the rear of the pipe. since you cant jam the lugs into the slide without killing the slide rails and slide release, its all on that little block o metal to keep her straight.

from a closed position push on the barrel through the ejection port. if you can move it, it can only have a lock up as random as the lottery.
hand fitting a barrel feels like a worthy challenge for me your yardage may vary.

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it just needs more voltage