I have to agree with bronko on the price being a little high. Personally, I would not pay that. I have a .50 flinter from the 70's that was not a kit that I will never sale because it was my grandfathers. If it wasn't his, I would look to get about $225-275. Kit guns seem to bring in less than factory guns because the t/c warranty does not apply to kit guns.

Do a search of completed auctions on ebay, gunbroker, and auction arms to get a price. A complete flintlock without barrel recently went for $200 on ebay. A .54 barrel went for $120, butanother .54 barrel didn't get a bid (both percussion). Locks (flint) have been fetching upwards of $70 on ebay. You just need to get hooked up with the right buyer.

All that being said, good luck on a nice looking gun.