- Best use in Conjunction with Metal Slide/Outer Barrel + High Flow Blowoff Valve
- Recoil Spring produces stronger & faster blowback feel
- Hammer Spring increase the hammer tension resulting higher gas output, i.e. more power fps
- Suitable for Marui Hi-Capa 5.1 / 4.3 Series Airsoft Gas Blow Black GBB Pistol
- As always, upgrading GBB require necessary skill & technique, consult expertise if needed

Major Color : Black
Built Material : Metal

*PS: Please note: installing parts / assemble /fitting airsoft gun will need intermediate knowledge; for expert or airsoft gunsmith. Please refer to your airsoft gunsmith for proper installation / fitting. Fitting may be needed as the condition of each airsoft gun might be different. Regular maintenance is needed for all airsoft guns in order to keep it in good working condition and reduce wear out issue on parts.