The K3G4 Assault Rifle based off of Heckler and Koch G3A4 is a 20 round automatic rifle that possessed the capability of penetrating flak jackets. This gun was used in Syphon Filter, 2, and 3, and was classified as a assault rifle, even though it was fired one handed. The design is nearly identical of the PK-102 assault rifle from Syphon Filter and 2, but excluding the stock.
Trivia
The K3G4 Assault Rifle based off of Heckler & Koch G3A4, which is in fact quite a bit longer than the one in-game and has a telescoping stock.
Aside from the Desert pistols and the Barrett M82 50-cal sniper rifle, it is the only weapon in the game that can kill flak jacket-wearing enemies without headshots, leaving the armour for the player to pick up.
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