The Barret M82 is an American-made anti-materiel sniper rifle chambered in .50 BMG.
During the Vietnam War, American snipers took to mounting telescopic sights on .50 caliber Browning M2 machine guns, owing the cartridge's excellent long-range capabilities. As a result, Ronnie Barrett founded Barrett Firearms Manufacturing for the sole purpose of developing a long-range sniper rifle chambered for the .50 BMG cartridge. In 1982 the M82 went on sale, although the weapon was not a major success until the M82A1 version was introduced in 1986.
Contrary to how it is usually depicted in movies, the M82 is rarely employed in an anti-personnel role (although it is occasionally used to defeat human targets, particularly those hiding behind sturdy cover). Rather the rifle is used to destroy enemy equipment, and has also been adopted as an explosive ordnance disposal tool — in other words, explosive devices are remotely detonated by shooting them at long range with the Barrett sniper rifle.
In Predator 2, a Colombian Scorpions member with El Scorpio is seen retrieving an M82A1 from the gang's armory during their firefight with the LAPD. However, he is killed by the City Hunter before he can use it.