How To Beat Metal Gear REX
First off, throw a chaff granade before REX has any chance to do anything. After the radar is jammed, aim for the cirrcular disk thing on REX's right shoulder and hit it with your Stinger. This will continue until an intervention from the ninja. In the second phase of the battle, chaff's will be useless, all you be to do is aim at Liquid in the cockpit and fire away. A very easy Boss.
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