Hi, I think that rifle of Mitch's is a bench copy of the "Woodsrunner" rifle. They all have code names, LOL, and it's hard to keep them straight. I used to mix the Woodsrunner rifle up with the "feather rifle".
Wallace Gusler wrote about the Old Holston Rifle, an iron-mounted, walnut stocked "black rifle" in several Muzzle Blasts articles a few years ago. It's a 1770's-attributed rifle with an open forged iron guard (like Ian's) but is plainer than Ian's that I posted the link to, above.