Type Anti-materiel rifle, Sniper rifle
Place of origin United Kingdom
In service Not yet entered service
Used by United Kingdom, US, Republic of Ireland and others
Wars Not yet entered service
Designed 2005 or 2006
Number built Unknown
Variants 1 AS50
Weight 27 lb (14.1 kg) (no scope/sight, empty mag)
Length 53.9" (1369 mm)
Barrel length 692 mm
Cartridge 12.7 x 99 mm NATO
Caliber 12.7 mm .50 BMG
Action Direct impingement
Rate of fire semi-automatic, estimated at 5 rounds/1.3 seconds
Effective range 1,500 m 
Feed system 5 or 10 round detachable box magazine
The AS50 is a .50 BMG sniper/anti-materiel rifle manufactured by British firearms producer Accuracy International. The AS50 enables operators to engage targets at very long range with high accuracy using explosive or incendiary ammunition. The AS50 employs a gas operated semi-automatic action and muzzle break, 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.
The rifle has an accuracy of 1.5 MOA. The barrel is free floated. The two-part machined steel receiver features an integral accessory rail for the mounting of optical sights. Two additional rails are mounted on the sides of the short barrel shroud. An adjustable bipod and rear support leg/hand grip allow for stable shooting. This weapon can accurately engage targets at over a mile's distance.
The AS50 weighs 14.1 kg empty and holds 5 rounds of .50 BMG in a single stack removable box magazine.