Advanced Firearm Training

Prerequisite: Proficiency with personal firearms, 4th level

You can use an action to steady your aim. Choose a creature that you can see within the
weapon’s range. If your next action is a ranged weapon attack against this creature, you
gain advantage on the attack roll and score a critical hit on a natural roll of 19 or 20.

When using an automatic weapon, you can fill a 10-foot cube within the weapon’s normal
range with a hail of bullets as an action. Any creature in the affected area must make a
Dexterity saving throw (DC 8 + your proficiency bonus + your Dexterity modifier). On a
successful saving throw, the creature only takes half the weapon’s damage, or no damage if
they have cover. Using this technique expends 10 pieces of ammunition.