RE: Flintlock ???
Well, this is a long shot Grouse, but you might give it a try.
Green Mountain makes a 15/16", 45 caliber pistol barrel in a 1:20 twist - but they are only 12" long. You might try calling them to see if they can produce a rifle length barrel for you. If so, they can probably even install your existing breech plug if you pull it off and send it to them. Then you can drill a touch hole where you want it, or install a liner.
http://www.gmriflebarrel.com/productdetail.aspx?id=323872
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Things I've Learned:
(1) It's not possible to please everyone, but quite easy to piss everyone off.
(2) If you love animals as I do, then you're not a vegetarian.
(3) There's no need to act stupid, even if you're very good at it.
(4) If you eat right and exercise, don't smoke or drink, you're going to die anyway.
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