I have owned the bronze field gun for over ten years. It was made by Dean Duvall of Lake, Michigan. While he had the tubes cast for him, and then polished them out, the carriage is 100% hand made by Dean. Fittings and all. The tube was cast solid and then bored.
The naval tube was made by Dean Lardie of Onondaga, MI. His cannon business goes by the name Gunsmoke Cannons, and I believe they have been listed on GBO before. This gun has a 4140 steel sleeve, a pinned and welded breech, a reduced size chamber, and has a cast iron exterior around the sleeve. I designed and made the carriage, starting from plans I found on the internet for the carriages on the USS Constitution. Of the two cannons, this is the better shooter. The field gun is pretty, and can make a lot of noise. But, I trust the naval gun a bit more for shooting.
Of course the mortar came from Dominick, who is well known in these parts. And, great to do business with, I might add. I also purchased some new implements (worms) from Dominick, and I have been very pleased with those.