Most of these I use for search but they are universal

Class 1
Tar-21-silencer
spas-12-fmj
Semtex
stun
Sleight of hand pro
Cold-blooded
steady aim pro

Class 2
Barret-fmj
m9-akimbo
frag
stun
Sleight of hand pro
Stopping power pro
Steady aim pro

Class 3
M4a1-red dot sight+silencer
Spas-12-fmj+grip
frag
stun
Bling pro
Stopping power pro
Steady aim pro

Class 4
ump45-silencer+fmj
spas-12-fmj+grip
frag
stun
Bling pro
Stopping power pro
Steady aim pro

N00B D3STR073R
UMP (FMJ)
Magnum (Tacticle Knife)
Semtex
Flash
SoH(p)
Light Wieght(p)
Commando(p)

Name"Knife TROLOLOLOLO"

Ump Silenced
Deagle Tac Knife
 Scanvengar
Lightwieght(Pro)
Sitrep/Commando/Ninja  (All Pro)
Throwing Knife
Stuns

IM liking the Specialist Strike Package, all the perks in the game, Im almost unstoppable, except for hackers, and the lagg.

MW3 Set Up

P90 with Rapid Fire and Red Dot Sight
USP.45 with Tac Knife
Throwing Knife/Flash Gernades

Perks
Slight Of Hand
QuickDraw
Stalker

Kill Streaks
Predator Missile
Strafe Run
Pave Low

My favorite and best class in mw3:

Mp7-silencer
5seven-akimbo

Frag
Flash

Sleight of hand Pro
Hardline Pro
Steady aim Pro

Specialist-Because of hardline i get the killstreaks at 1-3-5-7 so with hardline every 2 assists i get a kill towards my killstreaks

Quickaim Pro
Assassin Pro
Stalker Pro

MW3 Loadout favorite is:

AK-47 w/Extended Mags or G36C w/Red Dot or FAD w/Silencer
MP9 w/Silencer

Semtex
Flash or Stun (Depends on the players)

Sleight of Hand Pro
Quickdraw Pro
Stalker Pro

Support-CUAV, Advanced UAV, Stealth Bomber

MW3 Set Up

MP7 with Rapid Fire and Silencer
USP.45 with Tac Knife
Semtex/Portable Radar

Perks
Scavenger Pro
Assassin Pro
Steady Aim Pro

Kill Streaks
Predator Missile
Reaper
Osprey

CoD4:MW1

MP5 with a Silencer
Desert Eagle
Stuns/Frag

Bandolier
UAV Jammer
Steady Aim