I am not surprised that no one has mentioned James T Butler, Jr. and James B. Whiskers, Old Bedford Village Press book "Long Rifles of Virginia" in this topic. (At least I didn't see mention of it.)
I just spent some time going completely thru my copy of that book and think some of the things I saw are worth mentioning.
First off, the authors did not mention that Virginia rifles typically having iron furniture. No iron butt plates, no iron trigger guards, no iron patchboxes, no iron nosecaps or thimbles.
If iron furniture was at all common, I would have expected they to say something about it because it is a large departure from the Pennsylvania guns most people think of when they talk about longrifles.
Although the pictures are all black and white, it is fairly easy to tell if the furniture is brass or iron.
If I don't poop out first, here is a listing of the rifles. bbp = brass butt plate, bpb = brass patch box, btg = brass trigger guard. If the picture doesn't clearly look like brass and is possibly iron, it will have a ? in it like ?bp, ?pb, ?tg FL = flintlock. PL = percussion
J.B. = FL, unknown bbp, bpb, btg
George Baker = PL, ?bp, bpb, ?tg
Christian Beck = FL, bbp, bpb, btg
Christian Beck = FL, bbp, bpb, btg
Christian Beck = FL, bbp, bpb, btg
Christian Beck = PL, bbb, bpb, btg
G. Bogan = FL, bbp, bpb, btg
William Britton = FL, bbp, bpb, btg
John Bullard = FL, bbp, wood pb, ?tg
James Clark = FL, bbp, bpb, btg
James Clark = PL, bbp, bpb, btg
John Crummy = FL, bbp, bpb, btg
Joseph Daniels Sr. = PL, bbp, bpb, btg
Joseph Daniels Sr. = PL, bbp, bpb, btg
John Davidson = FL, bbp, bpb, btg
William Evick = FL, bbp, bpb, btg
William Evick = FL, bbp, bpb, btg
J. Fisher = PL, bbp, bpb, btg
William & Cyrus Fisher = PL, bbp, bpb, btg
Lewis Ginger = ?bp, no pb, btg
Jacob Funk = FL, bbp, bpb, btg
George Glaze = FL, bbp, bpb, btg
J.J. Good = PL, bbp, bpb, btg
George Grandstaff ? = FL, bbp, bpb, btg
George Grandstaff = FL, bbp, bpb, btg
Henry Harding = FL, bbp, bpb, btg
Abraham Honaker = FL, bbp, bpb, btg
Abraham Honaker = PL, bbp, bpb, btg
John Lauck, Winchester = FL, bbp, bpb, btg
Simon Lauck ? = FL, bbp, bpb, btg
John Lauck, Winchester = FL, bbp, bpb, btg
John or Simon Lauck, Winchester = FL, bbp, bpb, btg
John Lechner = FL, bbp, bpb, btg
Jacob Lewis = FL, bbp, bpb, btg
Jacob Lewis = PL, bbp, bpb, btg
William Liggett = FL, bbp, no pb, btg
William McClure = PL, bbp, bpb, btg
Alexander McGilvray = FL, bbp, bpb, btg
Alexander McGilvray = FL, bbp, bpb, btg
Alexander McGilvray = FL, bbp, bpb, btg
Nathaniel Oats (or Offutt) = PL, bbp, bpb, btg
John Painter = PL, bbp, no pb, btg
John Painter = PL, bbp, bpb, btg
William Reynolds = PL, bbp, bpb, btg
Benjamin F. Shane = PL, bbp, bpb, btg
Frederick Sheetz = FL, bbp, bpb, btg
John or Henfy Sheetz = FL, bbp, bpb, btg
Frederick Sheetz = FL, bbp, bpb, btg
Jacob Sheetz = PL, bbp, bpb, btg
John Jacob Sheetz = FL, bbp, bpb, btg
John Jacob Sheetz = FL, bbp, bpb, btg
William Miller Sheetz = PL, bbp, bpb, btg
Zebulon Sheetz = PL, bbp, bpb, btg
William Sink = PL, bbp, bpb, btg
G. W. Sites = ?L, bbp, bpb, btg
John Peter Sites = PL, bbp, b cap box, btg
William Sites = PL, bbp, bpb, btg
Charles Spitzer ? = FL, bbp, no pb, btg
Henry Spitzer = FL, bbp, bpb, btg
Henry Spitzer = FL, bbp, no pb, btg
William Spitzer = bbp, b cap box, btg
J. Thomas = PL, bbp, bpb, btg
Henry Topper = FL, bbp, bpb, btg
George Young = PL, bbp, bpb, btg
George Young = FL, bbp, bpb, btg
Unsigned = FL, bbp, grease hole, btg
Christianburg, Montgomery County ? = FL, iron bp, iron pb, iron tg
Unsigned Hampshire County ? = PL, bbp, bpb, btg
Unsigned Wythe County? = FL, ?bp, ?pb, ?tg
Unsigned southwestern Virginia? = FL, no bp, no pb, btg
I left out a number of pistols that were included in the book.
After all of that, I would say an iron mounted Virginia rifle would be about as rare as hen's teeth but for the die hards that want to try to justify their iron mounted longrifles, who am I to say they are wrong?