Now, to start off - this list is not an ABSOLUTE list, though I will try my best to give a good number of weapons of choice, if you wish to 'invent' a new weapon, just go ahead and PM me, we'll work it out.
the PIRATE
Kellinger Mountain Hunter Mark I
Fires the standard 8.23mm
without modifications, fires at 720 rounds/min
effective from 0-120m (single shot) 40m (auto)
high recoil, med-high damage

Grape and Company Sawed Off
Fires 7.9mm buckshot
depending on reloader speed, about 14 rounds/min
effective at ranges closer then 10m
high recoil, high damage

Kessler Guns Co, Speed 9
Fires 9mm
1500 rounds/min (overheats easily)
effective at ranges within 30m
low recoil, low damage