OP you contradicted yourself in paragraph 2. You said you wanted a system like Battlefield 3 where you can pick your gun and AA at the start but you can't change it. Battlefield lets you change it while you're in game.
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Sorry, I haven't played Battlefield in a long time. I meant you could pick any of the starting guns as well as an AA even if you had never played the game before
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My dream Halo 5 would be available on PC.