Phil, thanks for your reply. Yes I know the breech faces are not exactly perpendicular (90-degrees) to the water table. What the angle is really doesn't matter. What I'm saying is, if the back end of the barrels and the breech faces were exactly fitted when the gun was new, showing no light, they would probably show a slight gap at the bottom when the gun gets worn. Also saying that I really doubt every double gun ever made was so closely fitted when new that the barrels would show no light as written up by Cherrybomb. Surely there were better and lesser skilled barrel fitters. Also, I wonder if fitters in the days of yore may have had other things going on Monday mornings or late Friday afternoons, same as modern workmen. Silvers