That's usually for Hardpoint. In KC or TDM I might swap FMJ for Silencer and Hardline for Ghost. And if there are EMP grenades everywhere, I'll swap Primary Gunfighter for Perk 2 Greed and Fast Mag for Hard Wired. Solid three classes, usually I have a slot for each setup, since I have 10 classes I don't mind using them all. These are my go-to, f*** these guys, I'm winning this s*** type classes.
I used it for a while last prestige, I'm not a huge fan, but its not bad I guess. If you are very accurate and hit the first 2 bullets on your target the TTK is crazy fast. Otherwise if you spray it full auto and let the PRM slow down it feel like you are shooting blanks.