Not exactly what you're looking for, but I've got a .50 cal Great Plains percussion that I bought last year. I got it all sighted in and it's a great rifle. Hunted last season with it but only had one opportunity that I can't blame the gun for. Fit and finish on it is great, and of the different rifles I've had a chance to handle it had one of the more positive feeling locks. I did meet a guy that had the .50 cal in the flintlock version of it. He's big into blackpowder and has probably at least a dozen either sidelock percussions or flintlocks, including some much more expensive than the Lyman, and still regards it as a very accurate rifle. Check Midsouth for a decent price if you decide to go for it.