Exclusive Hero for GMS?

Bowguns aren't too much of a stretch to imagine since Windraiders have had them for years, but how many other ways are there to use a bow and arrow? That's the textbook definition of archery, using a slingshot or blowgun or holding arrows between your fingers and slashing people with them aren't forms of archery.

Whereas pirates routinely wear heavy mechanized suits of armor?

I think slings, blowguns, or atlatl could all be acceptable weapons for a third branch of bowmen, in maplestory.