Robertson Trading Post in Henderson, Tn, has records of where Buford purchased guns from Mr. Fred Robertson.

Mr. Robertson started keeping firearms records before the 1968 gun control act.
I looked thru some of the A&D books and found where Buford purchased his guns. I didn't make any copies or anything because that's not what I was looking for.

Mr. Fred Robertson is the one who cleaned Bufords revolver after his wife was ambushed.