Barrett M82

RangedWeapon Attack: +8 to hit, range /1,969 ft., one to three targets. Hit: 8 (2d10) [Piercing] damage. The Barrett M82A1, standardized by the U.S. military as the M107, is a recoil-operated, semi-automatic anti-materiel sniper system developed by the American Barrett Firearms Manufacturing company. Despite its designation as an anti-materiel rifle, it is used by some armed forces as an anti-personnel system. The M107 variant is also called the Light Fifty for its .50 BMG (12.7×99mm NATO) chambering and significantly lighter weight compared to previous applications and the 15% heavier base M82 model.

984.5ft (196 squares) is how far the bullet travels per turn to hit, and increases each 984ft. Headshot. If an attack is made, and the target is humanoid and has an unarmored head, the attack is an instant kill and can be repeated in a "chain kill" event. Heavy hitter. The bullet is strong enough to penetrate light, and medium armor, and can pass through the target hitting anything behind the 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: Damage, Combat, Focus, Range, Two-Handed, Ammunition (Firearms), Reload, Slow