Battlefield 3 Operation Metro Exploit - Shoot through walls
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This glitch is done on the Russian side of Operation Metro. It is possible as an American but much harder due to the glitch being in Russian territory.
Play as the Recon class with the MAV unlocked. You can switch classes later by respawning on your becon.
Good idea would be to do this with a squad mate so you can respawn on each other as I've found spawn beacons to be very unreliable.