Can I get the weapon from Battlefield Bad Company by pre-ordering at a Gamestop store, if so, how?

I pre-ordered the game at my local Gamestop store, they gave me no special code. Can I unlock the weapon with an in-store pre-order or is this an online order feature only? Also, my friend wants to know if the Gold Edition has all the weapon unlocks already included.Can I get the weapon from Battlefield Bad Company by pre-ordering at a Gamestop store, if so, how?
You will recieve the code when you buy the game when it comes out. But when it does come out you better go get it early since they tend to never have enough.