[RedDragon]

Here's a Gekko. I designed this one with the 3e Robots Rules, as it is unmanned. The Gekko's official statistics are a lot less fleshed out than REX's are, so there was a bit of guesswork involved.

Gekko (circa 2014, as seen in MGS 4: Guns of the Patriots)[TL8+1]:

Backstory (!Spoilers!):

The Gekko was a large unmanned autonomous fighting vehicle developed by AT Corp for use in ground combat. Officially designated IRVING by the United States Army, Gekko were colloquially called "lizards" after the species of small lizard with a similarly spelled name: gecko. These war machines were created using a combination of technologies used in the production of Metal Gears REX and RAY. However, Gekko were not Metal Gear. Unlike true Metal Gear, Gekko had no nuclear launch capability. Instead, they were more akin to infantry fighting vehicles, with multiple units acting as a coordinated team in support of ground forces.

Sources: The Metal Gear Solid Wiki, MGS 4: Guns of the Patriots, MGR: Revengeance.

All components are TL8 unless otherwise specified.
[*]Body and Subassemblies: One arm on front of body, One Full Rotation Turret, Two Legs. Front of Turret has a 30-degree slope.
[*]Robot Brain: C4 Microframe in turret w/ the Compact, High Capacity, and +1 DX Booster options.
[*]Sensors: Basic Sensors in turret w/ the Acute Vision +2, Thermograph, 360-degree vision, Night Vision, Acute Hearing +1, No Sense of Smell/Taste, Telescopic Zoom 2, and +2 skill Search Radar options.
[*]Communicator: Basic Communicator in turret w/ the Disturbing Voice (manifested as animal-like chirping and lowing rather than an audibly unappealing voice), No Cable Jack, IFF Transponder, and IR Communicator options.
[*]Arm Motors: One ST 300 arm motor in arm w/ the Bad Grip, Extendible, Extra-Flexible, Retractable options.
[*]Propulsion: TL9 485kW leg drivetrain in legs.
[*]Built-In Weaponry: Fine quality Dagger concealed in arm, One talon in each leg, 7.62mm light machine gun in turret facing forward, with 100 shots in gun and 200 extra shots carried in turret.
[*]Accessories: GPS in turret, Gyrobalance in turret.
[*]Cargo Space: 2cf of cargo space in body, usually loaded with Hand Grenades.
[*]Power Systems: 488 kW Gas Turbine in body powers all systems using 39.05 gph of Diesel Fuel.
[*]Fuel and Fuel Tanks: 470-gallon light self-sealing tank in body, provides fuel for 12 hours of gas turbine operation.
[*]Endurance: 12 hours.
[*]Volumes: Arm 35cf, Turret 125cf, Body 315cf, Each Leg 110 cf.
[*]Structure: Heavy Frame Strength, Expensive Materials, except for legs which are TL9 Medium Frame Strength, Advanced Materials, and have the Biomechanical and Flexible options.
[*]Hit Points: Body HP 900, Turret HP 450, Arm HP 225, Each Leg HP 225.
[*]Surface Features: Sealed. One 300-lb Hardpoint on left, right and top of turret.
[*]Armor: Laminate Armor is PD 4 DR 35, except for front of head, which is PD 5 DR 42, arm, which is PD 3 DR 15, and legs which are TL9 Laminate Armor and are PD 4 DR 20.
[*]Biomorphics: Surface Sensors. Legs are sculpted.
[*]Statistics: Loaded Weight 11,722.3 lbs. Loaded Mass 5.86 tons. Empty Weight 7791.3 lbs. Empty Mass 3.9 tons. Robot Volume 695cf. Height 13.78 ft. Length 8.53 ft. Width 5.91 ft. Price $4,731,100. Body ST 1,800. Arm ST 300. DX 11. IQ 7. HT 12. Ground Speed 36mph. Ground Acceleration 7mph/s. Ground Move 18. Water Speed 8mph. Water Move 4. LC 0. 1,045 points.

Some Usual Hardpoint loads: Nuclear Demolition Charge (on top hardpoint; contains a 1kt Mini-Nuke. Heavy Frame Strength, average materials. Laminate armor is PD 4 DR 30. HP 18. SM -2. Weighs 104 lbs. Cost $102,400); M2 Browning Machine Gun (one on each side hardpoint; contains a 12.7mm Heavy Machine Gun. Heavy Frame Strength, average materials. Laminate Armor is PD 4 DR 30. HP 24. SM -1. Weighs 132lbs. Cost $9,200); ECM Array (on top hardpoint; contains Deceptive Jammer with Jam Rating 2(see GURPS Mecha p.84) and IR Jammer with Jam Rating 4. Heavy Frame Strength, average materials. Laminate Armor is PD 4 DR 30. HP 32. SM -1. Weighs 179 lbs. Requires 4.5kW (supplied by Gas Turbine) Cost $124,400).