MW2 Weapons and Attachments

 Primary Weapons

Assault Rifles

•           M4A1: Unlocked at Level 4. Fully automatic, all purpose weapon.

•           FAMAS: Unlocked at Level 1. 3-round burst.

•           SCAR-H: Unlocked at Level 8. Fully automatic, all purpose weapon.

•           TAR-21: Unlocked at Level 20. Fully automatic, all purpose weapon.

•           FAL: Unlocked at Level 28. Semi-automatic.

•           M16A4: Unlocked at Level 40. 3-round burst.

•           ACR: Unlocked at Level 48. Fully automatic, all purpose weapon.

•           F2000: Unlocked at Level 60. Fully automatic, all purpose weapon.

•           AK-47: Unlocked at Level 70. Fully automatic, all purpose weapon.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks M203/GP-25.

•           20 kills with Grenade Launcher - Unlocks Shotgun (attachment).

•           Marksman II: 25 kills with the weapon - Unlocks Red Dot Sight.

•           60 kills aiming down Red Dot Sight - Unlocks Holographic Sight.

•           Marksman III: 75 kills with the weapon - Unlocks Silencer.

•           15 kills with Silencer - Unlocks Heartbeat Sensor.

•           Marksman IV: 150 kills with the weapon - Unlocks ACOG Scope.

•           20 kills aiming down the ACOG - Unlocks Thermal Scope

•           Marksman V: 300 kills with the weapon - Unlocks FMJ rounds.

•           40 kills with bullet penetration using FMJ - Unlocks Extended Magazines.

NOTE: The AK-47 unlocks the GP-25, not the M203.

Submachine Guns

•           UMP .45: Unlocked at Level 1. Fully Automatic, close range.

•           MP5k: Unlocked at Level 4. Fully Automatic, close range.

•           Vector: Unlocked at Level 12. Fully Automatic, high fire rate.

•           P90: Unlocked at Level 24. Fully Automatic, large magazines.

•           Mini-Uzi: Unlocked at Level 44. Fully Automatic, close range.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks Rapid Fire.

•           30 kills with Rapid Fire - Unlocks Akimbo.

•           Marksman II: 25 kills with the weapon - Unlocks Red Dot Sight.

•           60 kills aiming down Red Dot Sight - Unlocks Holographic Sight.

•           Marksman III: 75 kills with the weapon - Unlocks Silencer.

•           Marksman IV: 150 kills with the weapon - Unlocks ACOG Scope.

•           20 kills aiming down the ACOG - Unlocks Thermal Scope.

•           Marksman V: 300 kills with the weapon - Unlocks FMJ rounds.

•           40 kills with bullet penetration using FMJ - Unlocks Extended Magazines.

Light Machine Guns

•           L86 LSW: Unlocked at Level 3. Fully Automatic, large magazines.

•           RPD: Unlocked at Level 4. Fully Automatic, large magazines.

•           MG4: Unlocked at Level 16. Fully Automatic, large magazines.

•           AUG HBAR: Unlocked at Level 32. Fully Automatic, high accuracy and damage.

•           M240: Unlocked at Level 52. Fully Automatic, large magazines.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks Grip.

•           Marksman II: 25 kills with the weapon - Unlocks Red Dot Sight.

•           60 kills aiming down Red Dot Sight - Holographic Sight

•           Marksman III: 75 kills with the weapon - Unlocks Silencer.

•           15 kills with silencer - Unlocks Heartbeat Sensor.

•           Marksman IV: 150 kills with the weapon - Unlocks ACOG Scope.

•           20 kills aiming down the ACOG - Unlocks Thermal Scope.

•           Marksman V: 300 kills with the weapon - Unlocks FMJ rounds.

•           40 kills with bullet penetration using FMJ - Unlocks Extended Magazines.

NOTE: The MG4 incorrectly states that FMJ rounds are explosive rounds.

Sniper Rifles

•           Intervention: Unlocked at Level 4. Bolt-Action.

•           Barrett .50cal: Unlocked at Level 4. Semi-Automatic.

•           WA2000: Unlocked at Level 36. Semi-Automatic.

•           M21 EBR: Unlocked at Level 56. Semi-Automatic.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks Silencer.

•           15 kills with the Silencer - Unlocks Heartbeat Sensor.

•           Marksman II: 25 kills with the weapon - Unlocks ACOG Scope.

•           20 kills aiming down the ACOG - Unlocks Thermal Scope.

•           Marksman III: 75 kills with the weapon - Unlocks FMJ rounds.

•           40 kills with bullet penetration using FMJ - Unlocks Extended Mags.

Riot Shield

Riot Shield: Unlocked at Level 4. Provides protection from bullet damage.

Challenges

•           Sponge I, II, III: Absorb 1000/10,000/100,000 damage with your shield.

•           Bulletproof: Deflect 1000 Bullets from your shield.

•           Backsmasher: Smash an enemy in the back with the Riot Shield.

•           Unbreakable: Get a 3 killstreak with the Riot Shield.

Secondary Weapons

Machine Pistols

•           PP2000: Unlocked at Level 3. Fully Automatic, close range.

•           G18: Unlocked at Level 22. Fully Automatic, close range.

•           M93 Raffica: Unlocked at Level 38. 3-round burst, close range.

•           TMP: Unlocked at Level 58. Fully Automatic, close range.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks Red Dot Sight.

•           Marksman II: 25 kills with the weapon - Unlocks Silencer.

•           Marksman III: 50 kills with the weapon - Unlocks FMJ.

•           Marksman IV: 75 kills with the weapon - Unlocks Akimbo.

•           Marksman V: 100 kills with the weapon - Unlocks Holographic Sight.

•           Marksman VI: 150 kills with the weapon - Unlocks Extended Magazines.

Handguns

•           USP .45: Unlocked at Level 4.

•           .44 Magnum: Unlocked at Level 26.

•           M9: Unlocked at Level 46.

•           Desert Eagle: Unlocked at Level 62.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks FMJ.

•           Marksman II: 25 kills with the weapon - Unlocks Silencer.

•           Marksman III: 50 kills with the weapon - Unlocks Akimbo.

•           Marksman IV: 75 kills with the weapon - Unlocks Tactical Knife.

•           Marksman V: 100 kills with the weapon - Unlocks Extended Magazines.

NOTE: Both the Desert Eagle and the .44 Magnum cannot accept a suppressor or extended magazines.

Shotguns

•           SPAS-12: Unlocked at Level 1. Pump-Action.

•           AA-12: Unlocked at Level 18. Fully Automatic, low ammo.

•           Striker: Unlocked at Level 34. Semi-Automatic.

•           Ranger: Unlocked at Level 42. Double barreled.

•           M1014: Unlocked at Level 54. Semi-Automatic.

•           Model 1887: Unlocked at Level 67. Lever-Action.

Challenges/Attachments

•           Marksman I: 10 kills with the weapon - Unlocks Red Dot Sight.

•           Marksman II: 25 kills with the weapon - Unlocks Silencer.

•           Marksman III: 75 kills with the weapon - Unlocks FMJ.

•           Marksman IV: 150 kills with the weapon - Unlocks Grip.

•           Marksman V: 250 kills with the weapon - Unlocks Holographic Sight.

•           Marksman VI: 400 kills with the weapon - Unlocks Extended Magazines.

NOTE: Both the Ranger and the Model 1887 can only accept the Akimbo and FMJ attachments. These attachments are unlocked at 10 and 50 kills respectively.

Launchers

•           AT4: Unlocked at Level 4. Vehicle Lock-on or free fire.

•           Thumper: Unlocked at Level 14. Unguided grenade launcher.

•           Stinger: Unlocked at Level 30. Vehicle Lock-on only.

•           Javelin: Unlocked at Level 50. Vehicle or location Lock-on only.

•           RPG-7: Unlocked at Level 65. Unguided RPG launcher.

NOTE: The Javelin and the AT4 are the only Launchers which only have one rocket. The other launchers have two.

Equipment and Support

Equipment

•           M67 Frag Grenade: Unlocked at Level 4. Cookable grenade.

•           Semtex: Unlocked at Level 4. Timed explosive. Sticks to people and surfaces that it hits.

•           Throwing Knife: Unlocked at Level 7. Reusable throwing blade. Throw it and pick it back up.

•           Tactical Insertion: Unlocked at Level 11. A flare that marks your next respawn.

•           Blast Shield: Unlocked at Level 18. Provides resistance to explosives and headshots, and grants immunity to Stun Grenades.

•           Claymore: Unlocked at Level 31. Trip detonated mine.

•           C4: Unlocked at Level 43. Remote detonated explosive.

Support

•           Knife: Default. Standard issue fighting knife, kills in one blow and is lethal in extreme close quarters situations.

•           Minigun: Found on various maps in defensive positions.

Source: www.wikia.com