Ballyhoo Mk.27

Magic Bonus. This weapon has a +2 bonus to attack and damage rolls

Nemesis. This weapon is a "Nemesis" to a specific Archfey and is the only thing that can deliver death to it. This weapon fades out of existence once it's purpose is completed.

Loaded Weapon. This weapon has 9 rounds that require an action to replenish 

Zorpal Weapon. While this weapon is attuned, and against Creatures with 100 or more total HP, this weapon deals an extra 2d6 Necrotic damage that bypasses resistances and immunities.

Rapid Shit. With every consecutive hit, this weapon receives stacks that go up to five times, these stacks are removed when this weapon goes a round without causing damage. With every stack this weapon gains a +1 to hit. With every stack this weapon takes less time to load. These are the loading times for every stack of Rapid Shit: (1: Bonus Action, 2:Reaction,3: Object Interaction, 4: Start of turn, 5: Ammo overflows and generate out of nothing.

Truesight Hand Cannon Sights. Using this weapon, you can aim down it's sights using your bonus action giving you 10 ft of truesight and 30 ft. of extra range

Hip-Fire Grip. While attuned to this weapon, on the first round of combat, you can use your reaction to draw this weapon and make one weapon attack. This feature also gives this weapon the Light Property

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: Weapon Property: Light, Damage: Necrotic, Bonus: Magic, Those Who Seek To Kill a God, Range, Ammunition (Firearms), Reload, Sap