DennisA can you clarify why you feel it would not be possible to regulate the barrels by moving them together. They have been cut to 24" and have a spread of approximately .150 at muzzle. Ellis Brown's book suggests that for an eight inch spread one needs to bring in the barrel muzzles .032" in as a starting point. Seems that I would have lots to work with or am I missing something?

As for weight we had considered filing between barrels with either lead or cerrasafe but decided there was to many things to go wrong. I can add 4-5 oz in the forearm but is that enough to matter?