you get extra mags as you get in modern warfare 2,too.
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most likely from the scavenger pro
Scavenger is a multi-player perk that allow you to pick up extra ammo for your weapons from dead bodies. The ammo appears as small blue bags on the ground near the dead body, just walk over it to pick it up. When you get Scavenger Pro, it has the same effect, but you start with max ammo in all your weapons.
use the perk 'warlord' or 'warlord pro' to get multiple attachments.
because you need to be fit to be able to run forever
Highlight the perk, press square (or whatever button for your console) and read about the challenges required.