[Willy]

As for hiding your rifle barrel, yes sto away space is often a problem if you need a long barrel - until you get creative! A boat especially a sailing ship has many long hollow spaces and tubes longer and with a greater diameter than a barrel. For example the ships railing, mast and so on, not to mention that every person with either money or being a skilled handyman can build hidden custom space for everything you want, especially if wood is the material.