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Extreme 400fps Internal Upgrade

Extreme 400fps Internal Upgrade Z-EXTREME400
Upgrade Overview
This upgrade will upgrade some internal gearbox components that will result in gearbox reliabilty and a firing velocity of roughly 400fps (using .20g bb).


Professional Installation

Kastway Airsoft prides itself in the care it gives to their service offerings. When you choose to upgrade your AEG, or have Kastway Airsoft work on repairing your AEG, you can rest assured that we will take very good care of you. We will ensure you are satisfied with the upgrade.

Please allow 10 business days to complete upgrade
Z-EXTREME400
  • What Gets Upgraded?
    • Velocity to 380-400fps
  • Parts Consumed In This Upgrade:
    • Systema 6mm Bushing set
    • Systema M120 Spring
    • Systema Nozzle
    • Systema Polycarb Piston
    • Systema Duracon Piston Head
    • Silicone & Gear Lubricants
    • Labor
  • Warranty30 day Limited Warranty
Your Price $152.00
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