I'm in the process of trying to change out my first barrel. The acton wrench and nut wrench came in, and i sprayed some PB blaster on the nut and began hitting the wrench with a dead blow hammer. After some serious pressure, I began getting movement. Except, the nut wasn't loosening...instead the entire barrel was unscrewing from the action. I tightened it up several times and tried again to get the nut to bread loose with no luck, so I just removed the entire barrel, with nut attached, and orderd a new nut from MIdway. Anyone else ever had this problem?