Weapon Modification is a weapon adjustment system in Counter-Strike Online.

Overview

You can grant experience points to weapons through materials, and when you reach the maximum experience point, you can get rid of the current weapon and obtain the next level weapon through modification. You can check the experience point acquisition probability on the web.

Updates

30 April 2026

Modification Stage Compression

• The weapon modification system, previously offered in 6 stages, will be compressed and revamped into 3 stages: T1 (Unique), T2 (Transcendent), and T3 (Legend).
• Weapons currently offered in 6 stages will remain unchanged, while new weapons will be provided in 3 stages starting from now.

Improvements to Legend Grade Exclusive Effects

• Changed to provide set effects up to a maximum of 3 stages based on the number of Legend grade weapons actually in use in-game.

Stage	Effects
1	Gain a shield when HP is below 50% (no shield duration limit) Remove movement impediments Temporary invincibility
2	Recover HP equal to a certain percentage of damage dealt while using Sprint/Deadly Shot in Zombie Mode
3	Re-grant Sprint/Deadly Shot skills when the remaining round time in Zombie Mode is below a certain level Reduce cooldown of Transcendent class active skills in Zombie Scenario Mode

• Effects of higher stages include those of lower stages.
• Legendary grade exclusive effects apply to all Legendary grade weapons.

Modification Materials

An item that can be used as a material when using the weapon modification system. It can be used to grant modification experience to weapons.

Name	Icon	Description
Normal		It is used for weapons of unique grade or lower.
Advanced		It is used for weapons of transcendence grade.
Special		It is used to specially modify the options (★) of a legend-grade weapon.

Available weapons

Gallery

See also

• Weapon Enhancement
• Part System