This can be a mountain howitzer, 1740 British Naval Mortar, or Lord Nelsen Carronade, depending on how u set up the trunnion. 9207076335. Builder does touch hole and carriage. Chase 4 inches, breach 4 inches, Trunnion faces 8 inch. Trunnion dia. 1 1/2 solid. Range 760 yds. Bore 1.695. May be illegal to use as punt gun.