I use the same thing, I used to use lightweight pro but it would suck if they got a UAV when im at their spawn. I been using Cold Blooded Pro and its been doing good. I voted for the MP5K, but it so unacurate and has bad recoil. If someone could tell me how to use the MP5K that would be good.
I use:
UMP45 Silence
Ranger Akimbo
Smoke and Semtex
Perk 1: Marathon Pro
Perk 2: Cold Blooded Pro
Perk 3: Ninja Pro