The Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch in Germany. It is a gas-operated, selective fire rifle with a rotating bolt. It's chambered for the full power 7.62×51mm NATO round, instead of the less powerful 5.56×45mm NATO intermediate cartridge. The HK417 is intended for use in roles where the greater penetrative power and range of the 7.62×51mm NATO round are required. It has been adopted for service by a number of armed forces, special forces, and police organizations.
Several members of the JSDF Special Forces uses these rifles during the Hakone Incident and the rescue operation of the Japan diplomats and pro-peace senator.
Heckler & Koch HK417 in real life
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A JGSDF SFGp operator aims through an Elcan scope with night vision on his HK417 to snipe an American CIA operative
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A JGSDF SFGp operator with his HK417 during the Hakone Incident
A JGSDF SFGp member fires his suppressed HK417