I have a 21" Green Mountain Long Range Hunter Flinter barrel that I am going to be putting in the classifieds forum.
Caliber: .50; Twist rate: 1:28; 15/16" across the flats (T/C Hawken); Length 21"; For flintlock ignition (with RMC vent liner).
There are a couple minor dings around the vent liner from the lock which i will touch up. But they don't affect the barrel at all. Bore is in excellent condition. Asking $150 TYD.
I'll give you guys first shot at it.
I have a couple more pic if you want