Here is a few hope it helps.For a run and gun map. Kill streaks spy plane, blackbird, chopper or dogs. I use a sniper quite a bit but that's different because it's difficult. I'm a team player I'm not worried bout kd because once I'm at the prestige I want that's when I will worry about it. But the shotguns are the most unused guns in the game, although you might miss a few kills it's fun and who docent get mad if they get shotty killed? Just fun stuff.
Stakeout w/grip python
Flash or stun grenade claymore
Hardline,or scavenger both pro.
Slight of hand, or steady aim both pro
Hacker, or marathon both pro
Ak47 silenced cz75
Stun tomahawk claymore
Ghost pro
Slight of hand pro or hardened pro
Hacker pro or marathon pro
My Beast class for RUN/GUN is as follows, which by the way can also be used with AK74U Rapid Fire & Grip <---duhhh!..LOL My KS also change depending on the game mode anything other than TDM changes to Sentry Gun/BlackBird/Attack Dogs
FAMAS +Red Dot & Extended Magz
Python+ Acog Scope
Semtex
Concussion
Claymore
Flack Jacket
War Lord Pro
Marathon Pro