The Stevens 67/77 series shotguns are not takedown actions. If you want to remove the barrel you'll need a barrel vise and make up an action wrench to unscrew the receiver from the barrel. They are fit up much like a bolt action rifle, i.e., screwed into the receiver with a relatively heavy torque at the end to align barrel and receiver. Typically, the barrel wouldn't be removed for rebluing . Polish the two together, same as you would a lever gun or bolt rifle.