whats best loadout on modern warfare.

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Kilo and MP5 all day if you want to sweat for kills.

Kilo + Kar/SP if you want to hang back a little bit.

I always end up with the mp5 at some point though

The best loadout depends on PC vs Console really. On Console the HDR is a better sniper than Ax-50/Kar98 in my opinion. MP5 and Kar98 is my favorite on PC.