Also often called the Barret light fifty, it is an icredibly powerful sniper rifle. It uses .50 Browning Machine Gun rounds, and it is accurate in distances in excess of 1000 m. A soldier in the first Gulf War killed a guard at 5905 ft with one of these. It treats most forms of bulletproofing like a joke and is actually considered a light antti-vehicle weapon. If one of these things hits you, it will not only go through you, but tear you apart on the way through. It is semi-auto with an 11 round clip.
That guard never even heard the round that killed him.
Damn, that M28A1 shot a round through both bulletproof windows of a car, killing the guy inside, and kept going....