This is a little outside your specs, but something you might be interested in. It's a 16 ga French guild sxs that comes in at or a little under 6 lb. I had bought it but the seller took it back and refunded my money when my smith confirmed my suspicion that the pitting was too severe, esp since there was a deep one just downstream from the left chamber. The buttstock is good - nice French walnut - could use a freshening on the finish, but it looked uncut. The forend is a bit rough - wear, not fit. The barrels are like a bad dirt road - my best guesstimate was someone shot it back in corrosive primer days and didn't clean it (properly). Nice engraving (looks WWI-era, from the style), not overdone, and sculpted balls with sideclips. Swamped rib. The screws were almost uniformly unbuggered. Lockup was tight and solid and I saw no daylight between barrels and receiver when I looked at it and felt no wiggle with or without the forend in place. Fit me well and pointed like a finger.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=218700980http://www.craggfirearms.com/Products---Used.htmlThis is one you could rebarrel (you can get barrels from Numrich, though the equipment and labor are another matter) and come out with a nice, light, lithe Frenchie to take along for whatever upland walk strikes your fancy. I didn't want to deal with the pain and suffering of a project gun (a few years back I went through rehabbing a pre-war Payne fly rod and once was enough), nor the cost of having someone do it. If you're set up for barrel work, this would be one up your alley, though a challenge b/c of the swamped rib and consequent tight tolerances.
I'm posting this b/c the guy who sold it to me (and took it back) played straight and was a through and through gentleman. He deserves respect for that.
If you don't want it, maybe someone else reading this will. It was just too nice a gun to toss.