Sig Sauer SP2022 280301 P403 CO2 Cap

Sig Sauer SP2022 CO2 Magazine Plug

 An essential component for the proper functioning of CO2 magazines for the Sig Sauer SP2022 airsoft CO2 gun, the clamping cap secures the CO2 cartridge in the magazine and ensures it is properly seated.

Description 

The CO2 cap for the SP2022 magazine (also known as a clamping screw or CO2 cap) is the part located at the base of the magazine that:

• hold the CO2 cartridge in place
• ensuring the cartridge is struck and the magazine is sealed
• to ensure optimal magazine performance

 Compatible with SP2022 CO2 magazines (KWC / Cybergun)
 Essential component of the CO2 system
 Easy to replace in case of wear or loss
 Metal construction (plastic version available since 2025)

 On this type of magazine, the CO2 system operates via a base-mounted clamping screw that compresses and pierces the 12g cartridge

 Note

• Very difficult to find as a standalone part
• Generally not officially distributed as a spare part
• Often replaced by purchasing a complete magazine

 Technician’s Note

“It’s a small but critical part: without it, it’s impossible to pressurize the CO2.

The problem is that these caps are rarely available individually from manufacturers. In 80% of cases, we have to rely on salvaged parts or a complete refill kit.

Tip: Always grease the seal and don’t over-tighten to prevent premature wear.”
Always apply a drop of silicone before installing the valve to prevent leaks

 Summary

• Part: CO2 cartridge cap / screw
•  Function: retention + cartridge activation
•  Availability: rare as a standalone part