You can play the Battlefield 4 BF4 single player campaign on ANY difficulty to unlock these weapons. And you can replay the final mission 3 times to unlock the 3 multiplayer class specific weapons, instead of replaying the entire BF4 campaign.

M412 REX - Complete the first mission Baku

Shank - Complete mission 5 Kunlun Mountains

Machete - Complete mission 6 Tashgar

P90 - Sacrifice Hannah

M249 - Sacrifice Irish

QBZ-95-1 - Sacrifice neither

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