I decided I'm not going to carry the SMG speargun on board as it heavy and classified as a firearm.
So I will be getting one of these Czech CZ BRNO RV85 26.5m ''flare riffle'' to stow in the console.
It has sights and can fire a flare 150 to 700 yards horizontal from the chrome lined 19'' barrel.Muzzle velocity, 100m per second. I like the added safety of a good flare gun on a boat. I will shorten the wood stock 4'' so it fits in a bracket in the console.
Cheers, Don