These are classes i use maybe could be useful too you as well

1. class for racking up assist and long shots
Mtar w/ TGF and fmj wildcard: Tac . Tacs :x2 Emp x2 shock charge
use scav and ghost or use tac-45 w/ extended clip

2. class for shot be one shot
mp7 w/Fmj,Long barrel and rap. fire (wild card needed)
Executioner: fmj and long barrel (wild card needed) and light weight
^ If people dont die after 3 bullets they are hackers

3. Hunting class
Shotgun rem. w/fastmeg,Msc perk:Ghost ,hard weild dead silence and emp

4. The annoying person
Lsat w/TGF,Quickdraw,rap.fire perk tought and flat jacket c4 and TPS

5. Streak killer
Mk48 w/Fmj, NV scope
smaw or fhj perk cold blood ghost blind eye engineer and black hat

6. The MLG NUB
AN-94 with what ever
second cross bow and with shock charge and stick perks and wildcards whatever you would like

 

Also guys post your top 6 gun set-ups ( I am looking for Mtar classes to gain bs and ls kills)
I want to hear what other people use so i can see how good they are.