Suppressed MP7 or ACR with extended mag.
Suppressed USP or one of the rocket launchers.
Sleight of Hand/ Blind Eye
pp90m1 with focus & extended mags. extreme conditioning/ assasin/ dead silence i use this to take out their spawn quickly. another good gun would be the usas or strike with damage/extended mags and same perks and lethal should always be c4. tactical i recommend trophy to block predator missles
if your confident in your skills..quickdraw beats assasin any day