Online you can get up to 256 players, but if you mean the whole community you'd have to look that up.
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256 players maximum can play in one match.
It depends on the game, but 7 controllers can work on the PS3 and some games have more than 4 players although many only have a single offline player. Online MAG may have 250 players i think 2 players
MAG is an online game with only a multiplayer mode see related link
No, MAG is exclusively for the PS3.
If you have to insert something onto your weapon, go to the weapon selection and below the picture of the weapon you can change it.