Gekko is the new "Metal Gear" featured in Metal Gear Solid 4: Guns of the Patriots. The Gekko is a mass-produced unmanned bipedal unit manufactured by ArmsTech Corp, and designated "Irving" by the U.S. Military.
Although not a literal Metal Gear, the top half is reminiscent of the Metal Gear REX design while the organic legs are somewhat similar to that of Metal Gear RAY. It is unmanned and uses two large cameras as its "eyes", one mounted on its head, the other at the front of its hip. These are backed up by other sensors. New features include a small robotic tentacle used to pick up small objects or grab targets. The Gekko is incredibly agile and maneuverable, thanks to a pair of flexible limbs that can act as either legs or arms. With these legs, the Gekko can pick up a man and throw him hard enough to penetrate a brick wall, deliver a kick that can overturn a 6x6 truck, dodge an RPG and kill its shooter, climb walls, crouch to enter buildings, run at speeds equivalent to a motor vehicle, and leap huge distances through the air. This model comes in multiple variants. Two of these variants are designed for standard combat; both carrying anti-personnel machine guns mounted inside the "nose", while one carries heavier machine guns and missile launchers. A third variant is the special purpose "Suicide Gekko", designed to invade enemy facilities in groups before self-destructing.
Similar in combat terms when compared with traditional Metal Gear models, relatively little firepower is needed to actually destroy one. A quick blast with an assault rifle may cause one to trip if shot in the legs. Corresponding shots to the "neck" can destroy a Gekko with small arms such as a M4 Carbine or P90. However, when a Gekko falls, it can quickly regain its footing even if tripped onto its head. Nonetheless, a heavy weapon such as any rocket-launcher, an M82A2, or the Rail Gun, can be used against the Gekko without requiring it to be collapsed.
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