Re: AR spring malfunction
Since it locked after firing with the bolt forward I would first try to move the bolt carrier/bolt forward to see it you can remove what's locking up the rearward movement. I'm guessing that forcing it to the rear may really jamb it up. I would try forward first.
“There will be a revolution in this country!”
“I don’t believe people should to be able to own guns.”
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war let it begin here."
~Captain John Parker, to his Minute Men on Lexington Green, April 19, 1775.