The M82 is a recoil-operated, semi-automatic anti-materiel rifle developed by the American Barrett Firearms Manufacturing. A heavy SASR (Special Application Scoped Rifle), it is used by many units and armies around the world. It is also called the "Light Fifty" for its .50 caliber BMG (12.7 mm) chambering. The weapon is found in two variants—the original M82A1 (and A3) and the bullpup M82A2. The M82A2 is no longer manufactured, though the XM500 can be seen as its successor, in that it also employs a bullpup configuration.


巴雷特M82是由美國巴瑞特火器制造公司生產的一種利用后坐力操縱的、半自動的反器材步槍。作為重型SASR(特殊用途狙擊步槍) 被世界多個國家的軍隊和警察單位使用。美軍昵稱“輕50”，因為其使用M2重機槍的大口徑.50 BMG（12.7x99 mm）彈藥。
此槍有兩種衍生型—原本的M82A1（A3）和采用無托式設計以便于攜帶的M82A2，隨后的XM500也繼承它的設計理念，使用了無托式設計。