Tiny Drill: I'm not telling anything
Harpoon Gun: It's the most powerful starting CC weapon (except the Rail Driver), it's purposefully very low capacity else it'd invalidate shotguns.
Rail Driver: See above. It's extremely powerful (and available from the store) so it has to be extremely nerfed in other aspects. Also - man, it's a mining tool, what a mining tool would need a multi-round magazine for?
Hand Cannon: Same thing. It's borderline OP already, and only because it's one of the staple pirate weapons.
Tommygun: Nope, it won't be buyable. Maybe the price of blueprints is too high, but it's a swag weapon, ie. exclusive, posh, cool, not for muggles and bean-counters. Besides, they went out of production 650 years before the game starts
Snubby: While the Ol' Revolver is your crappy Level One weapon, Snubby is higher-tier, not buyable and sees improvement later to rival the domination of the Handcannon.
Bow: Yeah I thought about all these cool things too, but eventually I've decided that reloading the bow with quivers is so anti-climatic I can't allow it, so I went in a wholly different direction to make it unique (think Crisis! Bow+Synthmuscle Suit is a lethal combo). Rambo arrows however, I do miss them. Maybe there will be some other bow. Poisoned arrows, or rather darts, are planned in the future (they will arrive with a new enemy faction).