Duelling in Spaaaaaaace!

[Plane]

One thing that comes to mind with decorum and general consideration for the rest of the ship's crew/passenger wellbeing is none of that "pistols at dawn" nonsense if the firearms are strong enough to potentially cause a breach in the air seals (or maybe other important stuff like air tanks, electric grids), depending on how strong weapons tend to be vs the walls of ships.

For that reason, maybe weapons would be restricted to melee, or else come up with some kind of ranged weapon deadly to organics but which doesn't risk ship integrity.

Or maybe some kind of specialized dueling room with reinforced walls so you could use more dangerous weapons.