You have found yourself in possession of a unique weapon that fuses the concept of a Firearm and a Sword. With some practice, you've come to wield the weapon as proficiently as a sword with the deft accuracy that comes with use of a firearm. Unparalleled trigger control lets you fire your Firearm portion of your weapon on a hit, once when you take the Attack Action, and deal the firearm's damage as extra damage. You do not add any of your weapons normal modifiers for damage if you choose to use this feature. (Extra attack does not provoke this feature.) If you have learned the Two-Weapon Fighting Style, you may add any modifiers that would have otherwise been added originally to the damage rolls.
You have learned to load your single chamber weapon on the fly. So long as you are using the weapon with only one hand, you may load the weapon without having to slow your momentum. You can now reload at the beginning of each round if a round is not already chambered.