MW4 Encyclopedia: Weapon Level

Weapon Level is a weapon system featured in Call of Duty: Modern Warfare 3, Call of Duty: Black Ops II, Call of Duty Online, Call of Duty: Black Ops III, Call of Duty: Infinite Warfare, Call of Duty: WWII, Call of Duty: Black Ops 4, Call of Duty: Mobile, Call of Duty: Modern Warfare, Call of Duty: Warzone, Call of Duty: Black Ops Cold War, Call of Duty: Vanguard, Call of Duty: Modern Warfare II, Call of Duty: Warzone 2.0, Call of Duty: Modern Warfare III, Call of Duty: Warzone Mobile, Call of Duty: Black Ops 6, Call of Duty: Black Ops 7, and Call of Duty: Modern Warfare 4. Each weapon has its own individual rank and in order to unlock available Camouflages, Attachments, Proficiencies and Challenges, the player must rank up the weapon by using it in combat.

1 Call of Duty: Modern Warfare 3

1.1 Required XP

2 Call of Duty: Black Ops II

3 Call of Duty Online

4 Call of Duty: Black Ops III

5 Call of Duty: Infinite Warfare

6 References

Call of Duty: Modern Warfare 3[]

In Modern Warfare 3, when the weapon is leveled up, additional customization options are unlocked, such as the reticle of the attachable sights, excluding the Hybrid Sight, HAMR Scope, and Thermal Scope. Max leveling a primary weapon will unlock Gold Camouflage for the said weapon, although the final level requires substantially more experience than prior levels. The final level is 31 for primary weapons, while for the secondary weapons it's 10. Not all weapons require the same amount of levels to obtain camouflages, attachments and the like. Launcher levels are implemented to add longevity to the weapons, as there are no attachments or camouflages for them. To gain the weapon title for primary weapons, the player must unlock the last attachment, even if it isn't level 31.

The order and level with which items are unlocked for primary weapons remains similar across all types of weapon:

Weapon Level

Assault Rifles

SMGs

Light Machine Guns

Sniper Rifles

Shotguns

Red Dot Sight

ACOG Scope

Foregrip

Classic Camouflage

Kick Proficiency

Silencer, Snow Camouflage

Silencer

Silencer, Snow Camouflage

Silencer

Multicam Camouflage

Snow Camouflage

Multicam Camouflage

Snow Camouflage

Target Dot reticle

Multicam Camouflage

Target Dot reticle

N/A

Multicam Camouflage

Grenade Launcher, Digital Camouflage

Digital Camouflage

Grip, Digital Camouflage

Multicam Camouflage

N/A

Impact Proficiency

Range Proficiency

Impact Proficiency

N/A

Focus Proficiency

Hex Camouflage

Impact Proficiency

Digital Camouflage

ACOG Scope Delta reticle

Rapid Fire

ACOG Scope Delta reticle

Digital Camo

Hex Camo

Attachment Proficiency, Rapid Fire

Attachment Proficiency

Source: https://callofduty.fandom.com/wiki/Weapon_Level. This is an independent Call of Duty: Modern Warfare 4 reference page.