My nig, the PB section is mine.
I run this bitch.
MP7 is good, but it's the kind of gun where it's headshot or die.
If you want to get a sniper, the dragonuv is good because it's accurate, strong, and has a 10 round clip. The only con is it's ugly as fuck, which is why I use PSG1.
As for the training cards, get them when you can afford them. It's worth it 100%. You get exp for doing them, plus you unlock titles that give you contracts to things like daul handguns, daul knives, C5, and really good weapons. They also give you medals, like master medals that are useful for building yours stats up like accuracy, weapon control, rates per minute, speed etc.
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Da Kurlzz