Don't do that!
You could get banned from the server as most servers dislike mods.
Just be on the safe side and only use it in single-player
You get to use it in both campaign and multiplayer, but only as secondary on campaign, and in multiplayer there are entire matches for crossbow.
Use the INTERNET!
No, multiplayer stats are stored on the server.
No you can't :(
No.
The multiplayer weapons are not for competitive play and that is why you cannot equip them. In the competitive multiplayer you have to pick up weapons arround the map. In the Co-OP multiplayer however you can choose what weapons you wish to use before you start.
No.
u can use htem in multiplayer
No.You are use bipod on mp (multiplayer).
You can play multiplayer before you even start story mode, but you might not have all the multiplayer stages.
nowhere, but if you use your phone by pressing up on the dpad, and press the x/a button, you should be able to scroll to multiplayer!
A legit premium account can be used for both Singleplayer and Multiplayer.