Get 250 kills with a weapon with two attatchments, get 10 frag or semtex kills, and one multi-kill with frag or semtex.
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use the perk 'warlord' or 'warlord pro' to get multiple attachments.
you get extra mags as you get in modern warfare 2,too.
most likely from the scavenger pro
i gives you one more grenade in each slot (one more special and one more primary) If you pick certain upgrades for your guns (primary and secondary) there will be a few upgrades for your guns. In other words, you can pick certain upgrades then you can pick another upgrade.
because you need to be fit to be able to run forever