first let me say I love the weapons in the game as they all have a role to play and a large skill ceiling. However, there are a couple of tweaks I wouldnt mind seeing.
Starting with the double pistol while this weapon is lovly in its current state seeing it changed to a duck foot pistol or even having a duck foot pistol added would allow the double pistol to retain its multishot charm without incroching on the pistols utility.
Next for the grapple gun I would love to see an alternate ammo that allows for a placeable line to balance on. Not only would this give the gun more loot running utility it would also give you another means and chance at movement should your hooks brake on terrain without pulling you to it.
Now for weapon ideas that could be added to the roster.
First, a Bow and Arrow or Crossbow this would fill a simaler position as the BlowPipe but be more geared for PVP useing Arrows, Firebomb Arrows, and either Blunderbomb or Skelloton Bomb arrows. This would be the thematic companion to the Blowpipe as stated before.
Next, a Ax and Sheild. useing Viking themes an Ax and shield ment to be the sword devensive conterpart whould be quite interesting. its move set would have a 3 hit light with the Ax a gaurd with the sheild (which could block bullets from the shoulders to the waist) and a shield bash from gaurd in place of a charged attack (has a large knock back). this bash could have a cooldown.
lastly, a supressed musket. though it sounds dumb, haveing a supressed long gun would tematicly fit your recent focus on stealth as well as round out a three weapon roster for an update roadmap.
what im hinting to witht hte last bit is the idea of ship class spacific cosmetics for example a viking long boat skin for the Brig, or a Chinese style ship for the galleon, or a scaled down turtelship skin for the sloop.
Please use any and all ideas here and I'd love to read others ideas on the topic! See you out there.