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). However, 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 respective carrier of that weapon had. The gun will act as if it had no proficiency, despite what weapon attachments or camouflages they are using. the only exception is the Attachment proficiency.

List of ProficienciesEdit

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.

VideosEdit