Movie "Wanted"; Flintlock Sniper Rifle
 

so my friend and I watched the movie Wanted yesterday, and he sees this huge (huge as in long) Flintlock/matchlock rifle that a couple of the characters in the movie used to snipe people from incredible distances.
Well, I make replicas of weapons. Before you freak out, I use lengths of pipe, nails, and unusable chunks of 2x4, so they have the general look of the weapon, they are held like the weapon, they are the same length as the weapon, but they are definately not good enough to be movie props!

So, my friend knowing this, he says, "Owen, can you build me that gun? I'll give you 20 bucks for it."
"If I can find any good shots of it, sure." I says.

and now I am stuck, I don't have to make every little detail, but the general look of the rifle would be a big help.
so far, this is all I dug up
http://www.imfdb.org/index.php?title...y_Sniper_rifle
can anyone help?

its not the correct answer but it may be the right trail of breadcrumbs
(radically different triggers)

http://en.wikipedia.org/wiki/Sharps_Buffalo_Rifle

http://home-and-garden.webshots.com/...29466406gVHXNr