Huddleup,
What length is the barrel you have now? If you want it real short, less than 22" you could have it cut and the bead replaced for around $50, maybe less at Gander. If 22" is short enough for ya, then you could go to Wally World and pick up a Youth 20ga w/Mod choke for less than $100. Many have found that a Mod choke shoots slugs as good as a cyl. bore. It just a matter of how much $$$ you want to spend and if you want a shotgun that is really custom. If the open sights is a big thing for you, then the Tracker I barrel from the factory is the way to go. That's gonna end up costing you close to $80 by the time you are done. If I remember correctly, is about $47 for the Tracker I barrel, $15 fitting, $10 shipping and then whatever it costs you to ship the receiver to H&R. Pretty close to $80, maybe more. You just have to decide what ya want and go from there. Good Luck
cookiemann