Kotobukiya Metal Gear Rex Metal Gear Solid Plastic Model Kit
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Metal Gear REX appears in Metal Gear Solid Mobile, although it's implied to be one of the REX derivatives. The REX unit, however, is later revealed to be part of a VR simulation by the Patriots. Otacon states that REX is armed with a "Vulcan Cannon," indicating the gatling guns are M61A1s, and later an entire Codec call focuses on REX's missiles being anti-tank weapons with laser semi-active homing, not radio-guided anti-infantry weapons. Translation: "Suicide unit" / "■ The suicide unit was also detailed with the position of the fuse unit and pilot lights. These modular units were designed by INT.")
REX's most fearsome weapon, however, was the magnetic rail gun capable of delivering an untraceable nuclear warhead anywhere in the world, without the propellant trail or launch flare that gives away the launch position of a traditional ballistic missile. By perfecting the process of electromagnetic acceleration, the rail gun is able to fire a projectile with a muzzle velocity of over 100 kilometers per second. It was apparently originally going to be used, as part of SDI, to shoot down enemy ICBMs outside the atmosphere.  Otacon stated that when fired outside the atmosphere, REX's nuclear rounds would have a radius of effect of 300 meters, and the gun would be sufficiently accurate to hit a satellite traveling at 10 kilometers per second.  The rail gun's feature was also implied by ArmsTech President Kenneth Baker to be illegal, and that were it to be discovered, his company would most likely end up shut down and Baker himself would most likely face an inquiry.  The game and the novel have differing explanations for how REX was able to beat RAY. In the game, it was stated to be because Otacon had secretly uploaded a program into REX during its development that the military did not approve of. In the novel, he implies that it was largely because the RAY Ocelot was piloting was reverse-engineered from an AI-controlled weapon to a manned vehicle, which left it at a disadvantage to REX, which was intended to use a human pilot from the start. In a pre-release trailer for Metal Gear Solid 4, some Gekko managed to wipe out the Middle Eastern militiamen in Ground Zero. Afterwards, they also released a greenish-yellow fluid (later confirmed to be lactic acid). In addition, within the Red Zone, they also were marching with a platoon of Strykers belonging to Praying Mantis, resulting in Snake (who was spying on them for reconnaissance) almost being spotted by one.  Although most of these weren't shown in the game itself, the former was nonetheless implied to have happened off-screen with Snake being pursued by Gekko early in Act 1.
Otacon describes REX's secret program to Old Snake in a Codec conversation during REX's battle against RAY. FEATURED FACT: METAL GEAR REX’s rail gun was an evolution of the technology used for the SDI program World Marshal Incident [ ] See also: Raid at World Marshal, Ambush in Africa, Abkhazian Coup, Investigation in Guadalajara, Raid in Denver, and Operation Tecumseh Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised. [?]
They also acted as carriers for Dwarf Gekko, which were a smaller, spherical, three-armed variant of the Gekko designed specifically to accomplish combat and infiltration situations that regular Gekko couldn't due to their size.
History [ ] Guns of the Patriots Incident [ ] See also: Liquid Sun, Solid Sun, Third Sun, Twin Suns, Old Sun, and Naked Sin/Naked Son The footstep sound it makes is actually a horse. When it approaches you, you have the cicada sound and the sound of a horse approaching you. Also, the cries of that machine are from a cow. So there's a horse, a cow, and a cicada. All that combined gives you a nature feeling. This is the mental, psychological way to kill an enemy. See, in a battlefield you have a tense feeling. But when this machine approaches you, you have the horse sound, and the cow cry, and the cicada cry, and it makes you forget where you are and think about your childhood. You feel a little peaceful.Support Roof Pattern: Grid ( this parameter should differ from Bottom Pattern Initial Layer in “Shell” section) Metal Gear REX appears alongside Metal Gear RAY and Metal Gear Gekko on the Shadow Moses Island stage in Super Smash Bros. Brawl. Vote now for who you want to make it to Round 2! Will METAL GEAR REX's weapon systems be able to stand up against the one man Hard Corps army that is Bahamut? Their fate rests in your hands!— with Luis Olvera.