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The subject of this article appeared in Call of Duty: Modern Warfare 3.

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.
Kick Proficiency MW3.png
All weapons, except the Riot Shield.
Range Increased range.
Range Proficiency MW3.png
Submachine Guns and Shotguns only.
Attachments Equip two attachments to the same weapon.
Attachments Proficiency MW3.png
All weapons, except the Riot Shield. (Is available on the Model 1887 but has no use)
Focus Reduced flinch when shot.
Focus Proficiency MW3.png
All weapons, except the Riot Shield.
Melee Faster melee.
Melee Proficiency MW3.png
Shotguns, Submachine Guns and the Riot Shield only.
Stability Reduced sway.
Stability Proficiency MW3.png
All weapons, except Shotguns and the Riot Shield.
Impact Better bullet penetration through walls (similar to Deep Impact and FMJ).
Impact Proficiency MW3.png
All weapons except for Submachine Guns, Shotguns and the Riot Shield.
Speed Faster movement with weapon equipped.
Speed Proficiency MW3.png
Light Machine Guns, Sniper Rifles, and the Riot Shield only.
Damage Shells do more damage.
Damage Proficiency MW3.png
Shotguns only.
Breath Hold breath while aiming down the sights.
Breath Proficiency MW3.png
Assault Rifles only.

Videos

Official_Call_of_Duty_Modern_Warfare_3_-_Weapon_Progression_Behind_the_Scenes_Video

Official Call of Duty Modern Warfare 3 - Weapon Progression Behind the Scenes Video