Battlefield 3 / Weapons and Attachments...?

Is it easier or faster to unlock weapons and weapon attachments in multiplayer mode or co-op mode???Battlefield 3 / Weapons and Attachments...?
Co-op only unlocks a few weapons. Those particular weapons can only be gained in Co-op. You can't get any of the other unlocks through Co-op, so you have to play Multiplayer for almost all of the unlocks.Battlefield 3 / Weapons and Attachments...?
The co op only unlocks new weapons.

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