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US Army Rifle XM8 — Description
Cartridge: 5.56x45mm
Action: Gas-operated, rotating bolt
Rate of Fire: 750 rounds/min
Muzzle velocity: 900 m/s
Effective range: 500m
Feed system: 30-round detachable box magazine, 100-round C-Mag drum magazine
Weight: 3.5 kg
Manufacturer: Heckler & Koch GmbH

There were high hopes that the XM8 would become the Army's new standard infantry rifle, the project was put on hold in April 2005, and was formally canceled on October 31, 2005.

Upd.(17/06/2013): Remade it from scratch