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Here's the email I got from Gamestop minus the actual code

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For people who got the codes but no instructions:
Dear Valued Customer,
Thank you for pre-ordering Call of Duty: World at War for PS3 from GameStop. Here are the instructions to unlock your special M1A1 weapon for use in multiplayer games 64 levels early.
1. Connect your PS3 to your broadband connection.
2. Register for a PLAYSTATION®Network account (For more information go to
You must login or register to view this content.).
3. Sign in to your PLAYSTATION®Network account on your PS3 console.
4. Once signed in, select "Account Management".
5. From the Account Management screen, select "Redeem Codes".
6. In the new screen that opens, enter your 12 digit voucher code, and then select "Continue".
7. Follow the on-screen instructions to redeem voucher content and download content from the final screen of the redemption process.
Your PS3 Voucher Code: 0000-0000-0000
Should you experience any problems when activating your code, please contact Activision directly for assistance at (310) 255-2050 or online at activision.com/support.
Thank you,
GameStop Customer Service.

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