Call of Duty: Modern Warfare 2 Beta: How to Unlock Gunsmith 2.0

If you're playing the multiplayer beta here's how you can unlock Gunsmith 2.0 and learn how it works in Call of Duty: Modern Warfare 2.

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Anyone else not able to put attachments on weapons ?? My M4 is an level 19/20 and only got 1 optic. : r/ModernWarfareII

Call of Duty: Modern Warfare 2 Beta: How to Unlock Gunsmith 2.0