Thread: Help please from out AR experts!

you don't normally get behind the locking ring usually around the outside. Some like Daniel Defense need their own special FF Tube wrench.
What Brand is the handguard?? Also you should use a proper action block for an AR and remove the rails / scope mt etc.

nor would I lt a gunsmith who doesnt do ar work near it

Actually looking at it I reckon a stap wrench and action vise block along with a bit of heat and it might spin off leaving the barrel nut in place maybe possibly