Though gunpowder is still relatively novel, and proper firearms are downright exotic, some enterprising sorts have taken to creating homemade, single shot projectile weapons out of piping, ball bearings and other readily available materials. The resulting weapons are a favorite of thugs and other unsavory types.
Ammunition, Light, Loading.
Damage varies with range:
30’-60’ feet: d6 (disadvantage to hit)
15 foot cone: d8, multiple targets
Ammunition may be homemade with training and the requisite supplies.