with a small problem(actually I have two barrels) the problem is the barrel which has a rear sight has the outside choke on it and I can't get it off! the other gun also an outside choke gun but has no rear sight! I want to get the outside choke off of the sighted gun and on to the unsighted one for strictly 410 use and experiment with ball loads with the other gun with sights either 410 slugs or 45 colt loads using a variety of different brass to fill the longer chamber including 303 444 and 445 brass until I find a load which works and is accurate. So how do I get this stuck outside choke off of the gun? Help.