The URX II is not rotation limited and you're on your way to a dangerous situation. Do NOT have someone local try to work on it unless they install and uninstall URX rails regularly since the barrel nut is a proprietary part and needs the $200 or $250 wrench to work on it.
This is part of the reason I traded one of my SR15's and why I ordered a RIS II to replace the URX II on my remaining sr15. Something like that happens while on a trip or during a class, it's most likely not going to be fixed until it's sent somewhere unlike a standard rail and barrel nut.
By any chance did you have the muzzle device replaced?
Proven combat techniques may not be flashy and may require a bit more physical effort on the part of the shooter. Further, they may not win competition matches, but they will help ensure your survival in a shooting or gunfight on the street. ~ Paul Howe
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