This is probably my favorite of the SMGs in call of duty ghost. However, I don't really don't use it the way most people do. Here is the primary class I use it with.
Primary Weapon: USR Sniper Rifle
Attachments: Variable Zoom, Extended Clip
Secondary Weapon: CBJ-MS
Attachment: Extended Clip
Perks: Ready up, Focus, Overkill, Reflex
Tactical Trophy system
I don't snipe that much in ghosts, but when I do, I am terrible with a sniper rifle in close quarters combat. I normally set up on a long sight line and camp, which is what you should be doing with a bolt action sniper rifle. There is nothing like having somebody come up on you and pulling this thing out. Most players expect a pistol when they get into close quarters with a sniper. Instead I have 1000rpm 51 round magazine SMG. It also wonderful to have when you come up against a dog or another score streak. Snipers usually die to dogs, but this thing shreds them like tissue paper. It's an expensive secondary because you have to use overkill, but a lot of time it's worth it. I run it in a similar fashion with a few other weapons including two LMG builds and one sniper class.