Bronzescale

+3 Weapon. 2d12 damage. 50/150 ft. range.
3 times per long rest, whenever you roll a 19
or higher on a d20 for a firearm attack roll,
you gain an additional use of Action Surge.
When you use Action Surge, roll for damage
for the first attack with advantage. All
following successful attacks, even across more
Action Surges, deal the same damage as the first
attack. A critical hit adds +7 to the damage.