Gatsby, the barrels are about .080 thick at the muzzles (approximately twice that of the usual ML shotgun) and the breech thickness is arrived at by subtracting bore D. of .98" from total O.D. of barrels as closely as I can measure them. Wall thickness of one barrel is about 0.315" thick at breech and the other about 0.354". Total weight of barrels alone is over ten pounds.
Aloha, Ka'imiloa