Good guns for low level people to high level people?

Hey guy's I'm about 2 weeks in to Crossfire and i have been bugged by the guns in the game. I have the k-2, starting gun, xm8 adv as perma weapons. I was wanting to ask the experienced peoples opinions about this subject. I am looking for a gun that's good all around. Any input is appreciated if it's on-topic. Thanks ^_^

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