Get An AK-47
To get an AK-47 you can just recruit a soldier, but if you can't be bothered just go to the Security Base, (best to do this when you need to get the map from there) then if you run forward, take out the guard and on the side of the big building where the map is, as you enter there you will see a door on the left which is locked, to unlock it you need to grap a soldier when there alive or unconsious drag them up to the door and it will open, then in the left of the room should be an item box! Grab it and you now have an AK-47.
More tricks, tips and cheats for this game are right here - Metal Gear Solid: Portable Ops cheats
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