AIP 120% Enhanced Recoil/Hammer Spring For Hi-capa 5.1/4.3

 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