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Mass Effect 3 Hints
AA Gun.
1 of 4: Move onto the metal flooring, then take cover behind the stick-out thing that has two heat sinks on it before you start firing on the geth ahead. (Note that there's a geth at the AA gun controls over to the right that you'll probably want to shoot first, since he's in the best position to fire back at you.)
2 of 4: After they're all down, look around for ammo, geth technology to salvage, and a Geth Spitfire heavy weapon. Pick it up, then go over to the "AA Gun Control" terminal and use it.
3 of 4: Choose a squad member to shut down the AA gun, then sprint back for cover at the spot you used before (or somewhere a bit closer). Use the spitfire weapon to destroy the geth prime as soon as you spot it, then move closer if you need to in order to target the other geth.
4 of 4: Eventually, the AA gun will be disabled, and you'll return to the previous objective.
