I don't know if this might be one of ours, but our McM's in White Oak Twp., Franklin Co., AR at that time. But there were more others than you might think. Two things might pinpoint where to start looking early on for you. Do a search online for Biggerstaff in AR. It's a fairly unusual name, might be able to find the family quickly associated w/McM. Check the 1880 census in AR for James &/or James Samuel. or James S. Might find him quickly that way as you know the age. If you find him let me know, we'll see if there's any connection. Wilda McMurry