The Vertical Grip and Ex Mag are absolute non-negotiables on a gun like this since it kicks so much and goes through bullets in almost an instant. Obviously, these two attachments effectively counter this directly and will enable you to also be more accurate in those medium to long-range battles.
Speaking of longer-range fights, the Barrel Extender will definitely aid you here but since the Vector is supposed to be used in more close-range combat, it does still require you to be smart and play the angles a bit more.
Your task is to deal 10,000 damage with SMGs, which is an easy one in the grand scheme of things since you can just use the default MP5 class right out of the gate and spray in those close-quarter situations.
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