Rail gun: Quick, wouldn’t require a lot of unusual elements, and it would take very little effort to modify the ship design to accommodate one. The best part was that it could shoot just about anything for ammo, although the more massive, the better. But it wasn’t as good a weapon as a missile, since the ammo wouldn’t pursue the target. Might be useful to shoot down incoming missiles, though. Hmm, could I make some kind of smart ammo?