Here is a post listing what is available in create a class on mw3,If I have missed anything please post below and I will add it
-Primary
-Assault Rifles
M4A1
M16A4
Scar-L
CM901
Type 95
G36C
ACR 6.8
MK14
AK-47
FAD
-Submachine Guns
MP5
UMP45
PP90M1
P90
PM-9
MP7
-Light Machine Guns
L86 LSW
MG36
PKP Pecheneg
MK46
M60E4
-Sniper Rifles
Barrett .50 Cal
L118A
Dragunov
AS50
RSASS
MSR
-Shotguns
USAS 12
KSG 12
SPAS-12
AA-12
Striker
Model 1887
-Riot Shield
-Proficiency
Kick - Reduced recoil when firing.
Impact - Bullets carry more damage through materials.
Range - Increase effective weapon range.
Attachments - 2 attachments can be added to a weapon.
Focus - Reduced flinch when hit.
Breath - Hold breath while aiming down the sights.
Melee - Faster melee.
Speed - Increased movement speed when using this weapon.
Stability - Reduced weapon sway while aiming down the sights.
-Attachments
Red Dot Sight
Silencer
Grenade Launcher
ACOG Scope
Heartbeat Sensor
Rapid Fire
Hybrid Sight
HAMR Scope
Shotgun
Holographic Sight
Extended Mags
Thermal
Variable Zoom Scope
-Reticle
Target Dot
Delta
U Dot
Mil-Dot
Omega
Lamda
-Secondary
-Machine Pistols
FMG9
MP9
Skorpion
G18
-Handguns
USP .45
P99
MP412
.44 Magnum
Five-Seven
Desert Eagle
-Launchers
SMAW
Javelin
Stinger
XM25
M320 GLM
RPG-7
-Attachments
Silencer
Akimbo
Red Dot Sight
Holographic Sight
Extended Mags
Tactical Knife
-Lethal
Frag
Semtex
Throwing Knife
Bouncing Betty
Claymore
C4
-Tactical
Flash Grenade
Concussion Grenade
Scrambler (same as Black Ops' Scrambler)
EMP Grenade (takes out enemy equipment/turrets)
Smoke Grenade
Trophy System (when an enemy shoots an explosive near this, it shoots out a projectile to destroy the explosive mid-air, preventing it from killing you)
Tactical Insertion
Portable Radar (similar to Black Ops' Motion Sensor)
-Perks 1
Recon - Explosive damage paints the target on the mini-map. Pro - Bullet damage paints the target on the mini-map.
Sleight of Hand - Faster reloading. Pro - Swap weapons faster.
Blind Eye - Undetectable by air support and sentries. Pro - Launchers lock-on quicker. Extra bullet damage versus air support and sentries.
Extreme Conditioning - Sprint for longer distances. Pro - Climb obstacles faster.
Scavenger - Resupply from dead enemies. Pro - Extra starting mags.
-Perks 2
Quickdraw - Faster aiming. Pro - Recover from equipment and grenade usage quicker.
Blast Shield - Increased explosive resistance. Pro - Resistance to flash and stun.
Hardline - Killstreaks require 1 less kill. Pro - Every two assists counts as a kill towards your killstreak. Deathstreaks require one less death.
Assassin - Undetectable by UAV, portable radar, thermal, and heartbeat sensors. Pro - Immune to CUAV and EMP. No red crosshair or name when targeted.
Overkill - Carry two primary weapons. Pro - 2 attachments on your secondary.
-Perks 3
Marksman - Identify enemy targets at longer range. Pro - Longer hold breath.
Stalker - Move faster while aiming. Pro - Delay enemy Claymore explosions.
Sitrep - Detect enemy explosives and tactical insertions. Pro - Louder enemy footsteps.
Steady Aim - Increased hip fire accuracy. Pro - Weapon is ready faster after sprinting.
Dead Silence - Move quietly. Reduce the effects of Recon. Pro - No falling damage.
-Strike Package
Assault
UAV -3-
Care Package -4-
I.M.S. -5-
Predator Missile -5-
Sentry Gun -5-
Precision Airstrike -6-
Attack Helicopter -7-
Strafe Run -8-
Little Bird Guard -9-
Reaper -9-
Assault Drone -10-
AC130 -12-
Pave Low -12-
Juggernaut -15-
Osprey Gunner -17-
-Support
UAV -4-
Counter UAV -5-
Ballistic Vests -5-
Airdrop Trap -5-
SAM Turret -8-
Recon Drone -10-
Advanced UAV -12-
Remote Turret -12-
Stealth Bomber -14-
EMP -18-
Juggernaut Recon -18-
Escort Airdrop -18-
-Specialist
Any Pro Perk -2-
Any other Pro Perk -4-
Another Pro Perk -6-
ALL Pro Perks until death -8-
-Death Streak
Juiced - Run faster for 6 seconds. -4-
Revenge - Locate the enemy who killed you. -5-
Final Stand - Get downed with your primary before dying.
Martyrdom - Drop a live grenade upon death.
Dead Man’s Hand - Run around with C4 strapped to hands.
Hollow Points - Increased bullet damage
