What are you using?  Specialist or Assault? 

Try Running Predator missile, Attack Heli, Reaper.

Not too hard to get pred then one streak leads to the next

my most closest to a moab streak was 15 kills...

i was running specialist PP90M1 with silencer and rapid fire... but got killed by a headshot ;-;

It depends.

If you are just going for kills that are higher. A 5/7/9 (pred/chopper/reaper) is by far the easiest set up to get kills. Basically the pred guaruntees you 1 kill, usually 2 which gives you a chopper which normally gives you a couple kills to the reaper.

For higher KSs I use a 5/9/17 as the reaper gives me about 3-7 kills giving me a good point to go on to the 17s. Some use a 7/9(or 12)/17 setup, but I can't consistently get 7 kills without a death, without camping.

MAKE SURE YOU HIDE WELL WHEN YOU USE YOUR KSs!

Personally my easiest 5/7/9 class is overkill with a SMG w/ range/rapid fire and a shotgun with damage. Yes these are probably the OPed guns right now, but why gimp yourself. Likewise I usually run DS, but if I am getting slaughtered or want to pump up my epeen then I through SRP on and go 25:3-5. I use this class when going solo

For my 5/9/17 class I run with a team that watches my back and use marksman with a silenced/extended mag ACR. I run assassin and blind eye pro with a stinger as 2 UAV shots is 2 less kills you need. Also staying off KSs guns helps a bunch.

The 5/7/9 doesn't really need silencers as you get your KSs so early and the basically give you the next KS. For the 5/9/17

If you're going for high KSs never use UAV or Care packages. Anything that comes in care packages don't add to kills for killstreaks. So if you get an osprey gunner in a care package and get 50 kills, your killstreak is still at 3 kills.

Personally, i am a guy who loves who try to every gun the game. (MW3) I haven`t found a singel who is my type. Type 95 is way to much overpowered, and i don`t feel comfortable with it, Acr is a good weapon, got it in gold. But it just gets boring when i just keep on spraying but dying. But one match i was playing some domination i picked up a gun from the ground. And that weapon was an Mp7. The most accurate smg i know about. And that is my gun. The killstreaks is on the lower level. Just 3,5 and 9. Because i`m not as good in MW3 as i am in Black ops.