Tut, the reason a 16 gauge Fox weighs about the same as a 20 gauge is that the breeches are lighter on the 16. What is preventing you from striking the breeches and breech balls on a 20 gauge until they are the same thickness as the 16? There has to be some weight there. It would also make the gun a bit sleeker in that area. I was probably being a bit optimistic when I said "under 5" but that was what I meant. How about under 5 1/2? With struck barrels, reduced breeches, ribless design, and skeletonized stock, 5 1/2 pounds in a 20 should be no problem.
