I am pretty sure the gun was stocked in Rockbridge County or vicinity. The comb and toe are just like the rest of the late flint guns in SW VA and E. TN. Of course, the gun could have a step toe and it would be very hard to tell from the angle. It's the trigger guard that is throwing me. It is so thin. It is also pretty beat up, but the man holding it could have been responsible for that. William A.A. Wallace is a direct descendant of William Wallace of Braveheart fame and is genuine Wild West hero in his own right. He is in the Texas Rangers Hall of Fame. They even made a movie about him in the 50's where his part was played by Chuck Connors and the script was written by Aron Spelling, of all people.
My big questions are did the rifle have a straight cheek piece or an oval (Hawken type) cheek piece; and what did the side plate look like? The more I look at he gun, the more I think the mounts have absolutely nothing to do with who was stocking it and there is no way for me to know what the side plate or cheek looked like.
I do think this photo is very instructive. It shows us the what kind of rifle an actual frontier hero carried. He bought the rifle when he was 19 and heading off to Texas to avenge the deaths of his brother and cousin at the hands of Santa Anna's Army. That was 1836. The photo was taken in 1872, and he still had the rifle, and it was important enough to him to have his picture taken with it. You know as a Ranger, he almost certainly had a Colt revolver and probably a Winchester repeating rifle. That is not what he had his picture taken with. His picture was taken with a perfectly plain, beat up old longrifle he bought a as green kid in Virginia. Who knows what happened to the rifle, though? Wallace was never married, and didn't have any children, and the Wallace family in Texas doesn't have the rifle. At least, the Wallace relative I am working for doesn't know where it is. Wm A.A. Wallace lived until 1899 and died in Bigfoot,Texas near San Antonio. He was buried in the Texas State Cemeterry in Austin, right in front of Stephen F. Austin.