Arcane Repulsor Cannon

This magic weapon grants a +3 bonus to attack and damage rolls made with it when it’s used to make a ranged attack, and it ignores the reload property. This weapons damage is force damage. If the target is a creature, you can push the target 10 feet away from you in a straight line.

If you load no ammunition in the weapon, it produces its own, automatically creating one piece of magic ammunition when you make a ranged attack with it. The ammunition created by the weapon vanishes the instant after it hits or misses a target.

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: Bonus: Magic, Replace Damage Type: Force, Damage, Combat, Range, Two-Handed, Ammunition (Firearms), Reload, Sap