I have a Thompson-Center Black Diamond XR .50 caliber muzzle loader, blued, I'd sell for $200 shipped (without the scope). If you want the scope too (a Leupold Vari-X III 1.5-5x) then increase the price to $465 shipped. For those who don't know, this rifle can use any of three ignition methods: 209 shotgun primers; musket caps; or #11 caps. See here for info on that:
http://www.tcarms.com/firearms/mzModernInline.php) One of the T/C scope rings is missing two of its four allen-head screws. This model has the longer barrel (26.5") and will handle 3 pyrodex pellets for extra velocity.
Jerry/AK