A friend aquired a very heavy-barrelled .40 smoothbore. The barrel is 28", Octogon to round, about 1 1/8 diameter. Fancy walnut(?) halfstock with finely engraved silver hardware, stamped 'Remington' at the breech end below the Drum. It may be a flint conversion. I suspect that it was/is a custom bench gun, but why smoothbore? Any ideas?