Highlight the perk, press square (or whatever button for your console) and read about the challenges required.
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Firstly, you need to earn Hardline (perk 1) pro and buy it once you have completed the challenge. Then go up to the care package and double-tap square. :) Hopefully this helps !!!
I am trying to find a easy way to unlock all pro perks I already have some pros but these r the ones i need OMA pro Hardline pro Danger close pro Steady aim pro SCRAMBLER pro Sit rep pro Last stand pro if u find easy ways 2 unlock these answer me back PPPPPPPPPPPPLLLLLLLLLLLLLEEEEEEEEEEEEEAAAAAAAAAAAASSSSSSSSSSSEEEEEEEEEEE
you get extra mags as you get in modern warfare 2,too.
most likely from the scavenger pro
use the perk 'warlord' or 'warlord pro' to get multiple attachments.