I shoot air rifles and handguns. Most of my rifles are break-barrels. I also shoot muzzle loading firearms. I would very much like to build a replica of a muzzle loading long gun, either a full stock "Kentucky" rifle or a half stock "Hawken" style but in air power, either break barrel, pcp, or Co2. I can take an existing air rifle and restock it to get the desired results by adding hex tubing around the outside of the barrel if that is the best method. Any suggestions? Thanks.