Call of Duty: Modern Warfare 2/Primary Weapons

Assault Rifles
The challenges for all Assault Rifles are the same.(MARS Sight is the same as Red Dot Sight)
 * Note:Veteran and Master Challenges are unlocked after Prestige 1 lvl 5.

Submachine Guns
The challenges for all Submachine Guns are the same.
 * Note:Veteran and Master Challenges are unlocked after Prestige 1 lvl 5.

Light Machine Guns
The challenges for all Light Machine Guns are the same.
 * Note:Veteran and Master Challenges are unlocked after Prestige 1 lvl 5.