I made a good buy on a centerfire rifle from a woman who was selling some guns and this muzzleloader was part of the deal. I've never owned a Knight before, only Thompsons. Can anyone tell me the rate of twist on this gun and if there are any 209 conversion kits available for it? Right now it has a musket cap nipple. I know it has a Green Mountain barrel on it but that's about all I know about it. Any help would be appreciated. Thanks.