I was thinking about basically using shotgun flechette rules for their range and spread.
Something like this: acc:4 damage 8p, AP-6, mode FA,RC.
Using an exotic weapon skill, and ammo of 10 or 20 depending on whether it's an in stock fuel drum or a belt or back carried one. And no Recoil.
Ofcourse it would set everything aflame that gets damaged by it per the fire rules.
What do you think?