Weapon Proficiencies are a type of weapon customization featured in Call of Duty: Modern Warfare 3. Proficiencies are unlocked as the weapon is leveled up. Only one Proficiency can be put on a single weapon and is only allowed to be put on primary weapons (including the second primary with Overkill Pro). All primary weapons have 6 available Proficiencies, except Submachine Guns, which have 7, and the Riot Shield, which has only 2 (Speed and Melee)
When the player unlocks the Specialist Bonus with the Specialist Strike Package, they are able to use all but three of the Weapon Proficiencies (Damage, Breath, and Attachments) on any gun. If any Proficiency besides the ones previously mentioned are currently on a weapon the player is using, it will not be stacked with the Specialist Bonus.
Picking up any dropped weapon will not give the player the weapon proficiency that the owner of that weapon had. The gun will act as if it has no proficiency, with the exception of Attachment. The gun's attachments (including the second attachment installed via the Attachment proficiency) and camouflage remain intact.
List of Proficiencies
|Weapon Proficiency||Description||Icon||Weapons Available|
|Kick||Reduced recoil.||All weapons, except the Riot Shield.|
|Range||Increased range.||Submachine Guns and Shotguns only.|
|Attachments||Equip two attachments to the same weapon.||All weapons, except the Riot Shield. (Is available on the Model 1887 but has no use)|
|Focus||Reduced flinch when shot.||All weapons, except the Riot Shield.|
|Melee||Faster melee.||Shotguns, Submachine Guns and the Riot Shield only.|
|Stability||Reduced sway.||All weapons, except Shotguns and the Riot Shield.|
|Impact||Better bullet penetration through walls (similar to Deep Impact and FMJ).||All weapons except for Submachine Guns, Shotguns and the Riot Shield.|
|Speed||Faster movement with weapon equipped.||Light Machine Guns, Sniper Rifles, and the Riot Shield only.|
|Damage||Shells do more damage.||Shotguns only.|
|Breath||Hold breath while aiming down the sights.||Assault Rifles only.|