A precision, semi-automatic rifle chambered in .50 BMG. .50 BMG, being the same caliber used in Browning anti-armor and anti-aircraft machine guns since World War I.
Primarily used for anti-armor or "anti-matierial" operations. Capable of stopping many small armored vehicles, it serves its purpose well. Its effective range is over a mile. Although impractical, it can be used as an anti-personnel weapon. For sniping "soft" targets, a lighter weapon like a 7.62mm rifle would be preferrable.
There's an artillery emplacement on a ridge about a mile North of here. Someone get me an M82.