Aequitas and Veritas

These two ornately engraved, pearl gripped, gold plated Desert Eagles were created to preserve truth and justice. Aequitas has "Aequitas" engraved on the right side and "Justice" engraved on the left while Veritas has "Veritas" engraved on the left side and "Truth" engraved on the right, along with other beautifully crafted and designed engravings.

In Nomeni Patri Et Fili Spiritus Sancti 

You have a +3 bonus to attack and damage rolls made with these magic weapons. Even though these guns are quite large, they are virtually weightless. These guns do 2d8 piercing damage and an extra 2d6 radiant damage. When you use an attack action with one of the guns you can use a bonus action to attack with the other one. The standard rules for two weapon fighting apply.

Protection of all the Angels in Heaven

While attuned to these magic guns, you have +4 to your AC and you gain advantage on initiative rolls and can add a d10 to your initiative. Because only the holiest may wield these weapons, you have resistance to radiant damage. You also have immunity to poison damage and being poisoned along with being charmed, frighted, paralyzed, petrified, and stunned.

The blood of the wicked shall flow like a river

These weapons are sentient. They are lawful good with an Intelligence of 15, a Wisdom of 14, and a Charisma of 19. The weapons communicate telepathically with its attuned wielder. They have hearing and darkvision out to a range of 120 feet. They can speak, read, and understand all languages that the wielder can. The voice of Aequitas is a soft spoken young woman while Veritas is that of a gentle sounding man.

The weapons were made with the purpose these weapons is to cleanse the world of wicked blood. Whether its demons, devils, or any other being that would be construed as wicked or evil.

Destruction

These weapons can only be destroyed by submerging them in the blood of an Angel and then tossed into holy fire. The guns will melt away and be destroyed where they will return to heaven.

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, Damage: Radiant, Bonus: Armor Class, Advantage: Initiative, Bonus: Extra Attacks, Immunity: Charmed, Immunity: Frightened, Immunity: Paralyzed, Immunity: Petrified, Immunity: Stunned, Resistance: Radiant, Immunity: Poison, Immunity: Poisoned, Good creature with proficiency in firearms, Damage, Combat, Range, Ammunition (Firearms), Reload, Sap