Now, we have (also from mw2blog.com) the weapons list for Modern Warfare 2.

Assault Rifles

• - M4A1
• - FAMAS
• - SCAR-H
• - TAR-21
• - FN FAL
  
• - M16A4
• - ACR
• - FN 2000
  
• - AK-47

Sniper Rifles

• - Cheytac M-200 Intervention
• - Barrett .50 cal
• - WA2000
  
• - M21 EER
  

Sub-Machine Guns

• - MP5K
• - UMP .45
• - TDI Vector
  
• - P90
• - Mini Uzi
  

Machine Pistols

• - PP-2000
• - G10
• - M93 Raffica
  
• -TMP

Shotguns

• - SPAS 12
  
• - AA-12
• - Armsel Striker 12 Guage
• - Ranger
• - M1014
• - Model 1887
  

Light/Heavy Machine Guns

• - L86 LSW
  
• - RPD
• - M64
• - Aug HBAR
  
• - M240

Grenade/Rocket Launchers

• - AT4 HS
  
• - Thumper
• - Stinger
• - Javelin
• - RPG-7

Hand Guns

• - USP .45
• - Colt .44 Magnum
  
• - M9
• - Desert Eagle

Gun Attatchments

• - Red Dot Sight
• - Heartbeat Sensor
• - ACOG
• - Silencer
• - EOTech Sight
• - Thermal Scope
• - Shotgun (Master Key)
  
• - Extended Clip
• - FMJ
• - Akimbo

Riot Shield

• - Riot Shield (Primary Weapon)
  

Melee

• - Combat Knife

Equipment

• - Frag Grenade
• - Semtex (Sticky Grenade)
• - Throwing Knifes
  
• - Tactical Insertion
  
• - Blast Shield
• - Claymore Mines
  
• - C4

Camouflage

• - Desert
• - Arctic
• - Woodland
• - Digital
• - Urban
• - Blue Tiger
• - Red Tiger
• - Fall

Once again, I will stress that these leaks are due to, and being confirmed by Xbox 360 Pirate users. When Kotaku contacted Infinity Ward’s Robert Bowling for an official statement, he released a tweet reading: “Can’t confirm nor deny any leaks for #MW2. Official stance is to just wait and discover the awesome yourself on November 10th.”

Source: mw2blog