M21 Sniper Weapon System
>
The M21 Sniper Weapon System in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle.... Wikipedia
Action: Gas-operated, rotating bolt
Barrel length: 560 mm (22 in)
Caliber: 7.62mm
Cartridge: 7.62×51mm NATO
Designed: 1968
Effective firing range: 460 m (500 yd); 900 m (980 yd) (with 3–9× scope)
Feed system: 5-, 10-, or 20-round detachable box magazine