I've gotten a few of em, I always use a silenced weapon (Preferably the Scar, CM901, G36C, Or the ACR, will attachments so I can add a sight to help deal with having no kick) Secondary would be FMG Akimbo, Always a good choice if you run short on ammo before you get the 8 point streak.
Perks: Blind eye, Assassin Pro, Stalker Pro/Steady Aim Pro
Specialist Perks: Sleight of Hand Pro, Steady Aim/Stalker Pro, Quickdraw Pro
Death streak: Juiced
I don't really like to do this since at one point they will catch on and start grenade spamming you..
I like to run around with an SMG ( Preferably Mp5/Mp7 ) with specialist on.
Once you get that 8 killstreak ( All Perks ), your set.
As long as you play it safe and don't run out into the open, you have a good chance. After every couple kills, move somewhere else, or else they will try to stop you by rushing you nonstop. So just try these tips and maybe they will work for you. Good luck!
Gun: ACR silenced
Gamemode: 6v6 (very important) Domination
Perks: Sleight of hand, hardline, and stalker
Specialist perks: Assassin, quickdraw, and marksman
I would really, really recommend getting every pro perk if you're not prestiging again. Every one of them helps in their own way. It makes it a lot easier.