CVA Buckhorn
I have CVA Buckhorn, and have ball with it. Sorry to hear that you are having trouble cleaning it. My procedure is, remove the barrel from the stock first. (mine is a two screw hold down) put the barrel in a vise, wrapped in a towel or heavy cloth, with the muzzle to the left. leave the trigger mech. in place for now - it gives you something to brace against turning. Take the back plug out, and bolt assembly. use the breach plug tool as stated. Your problem with a hard to open plug maybe it was in too tight in the first place. The manual warns against over tightening, and you may not have used anti-seize on it. I use Vaseline instead of commercial anti-seize. It is easy to dissolve in hot water, and does not interfere with firing, even though it is a petroleum product. Hope this is some help.