This little piece is just over 6cm long and of approximately .22 calibre. It is a working model, fully bored through, complete with touch hole. The dark patina would suggest a river find and it might be much earlier than 1795. It represents a ship's deck gun or possibly a light field gun barrel.

This model barrel is 8.5cm long and of approximately .177 calibre. Armstrong barrels were principally made for coastal batteries and men o' war from about 1860-85. Famously the CSS Alabama, a Confederate blockade runner in the US Civil War, was equipped with these.