The AS50 is a semi-automatic .50 BMG anti-materiel precision rifle manufactured by British firearms producer Accuracy International. It enables operators to engage targets at very long range with high accuracy using explosive or incendiary ammunition, and employs a gas operated semi-automatic action and muzzle brake, allowing for lower recoil than the AW50 bolt-action rifle and faster target acquisition. The rifle is highly transportable, ergonomic and lightweight. It can be disassembled in less than three minutes and serviced without tools.