This magic weapon grants a +20 bonus to attack and damage rolls made with it. Magic can be channeled through its barrel.

It’s up to you to decide whether a character has proficiency with a firearm. Characters in most D&D worlds wouldn’t have such proficiency. During their downtime, characters can use the training rules in the Player’s Handbook to acquire proficiency, assuming that they have enough ammunition to keep the weapons working while mastering their use.

Notes: Damage: Force, Damage: Piercing, Damage: Thunder, Damage: Radiant, Advantage: Ranged Attacks, Damage, Combat, Range, Ammunition (Firearms), Reload