The Barrett Model 99 "Big Shot" is a single-shot long-range precision rifle. The rifle uses a bullpup single-shot configuration with a pistol grip. This Barrett Firearms Company is known for its .50 caliber rifles, including the M82A1 magazine-fed semi-automatic rifle.
The M99 Sniper was developed by Barrett Firearms and first introduced in 1999. Externally similar to the M95, the main difference between this rile and it's predecessors is that while it's predecessors where mostly semi-automatic or bolt-action, the M99 is a single-shot only weapon; it had to be reloaded after every shot. Like most of Barrett's long-ranged rifles, it is chambered for the powerful .50 BMG round.