Complete the indicasted task to unlock the corresponding weapon.
F2000: Link your PSN or Xbox LIVE name to your Electronic Arts account. Log into your Electronic Arts account, then go to this page to associate your PSN or Xbox LIVE name with it.
USAS-12: Check your multi-player stats online and the weapon will automatically unlock the next time you sign on the game.
QBU-88: Unlocked through a unique code provided when the game was pre-ordered.
Uzi: Download the demo version, select the "Quick Match" option, choose to play a ranked match, and reach Rank 4.
M60: Go to findallfive.com, select the "Join the Battlefield Community" option, sign up with Electronic Arts, register for the Battlefield: Bad Company email newsletter, and you will receive a unique code by email to unlock the weapon.