Heckler & Koch HK417
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The Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch.
Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, ... Wikipedia
Action: Gas-operated short-stroke piston, rotating bolt
Barrel length: 419 mm (16.5 in) 508 mm (20.0 in)
Cartridge: 7.62×51mm NATO
Effective firing range: A2 16.5″: 600 m (656.2 yd); A2 20″: 800 m (874.9 yd)
Feed system: 10- or 20-round detachable box magazine
Height: 213 mm (8.4 in)
In service: 2006–present