Aip 140% Recoil and Hammer spring upgrade set

Suitable for most brands of Hi-Capa 5.1 / 4.3 Series GBB (GasBlowBack) Pistol

- Best use in Conjunction with Metal Slide/Outer Barrel + High Flow Blowoff Valve / Flute Valve.

- Recoil Spring produces stronger & faster blowback feel

Hammer Spring increases the hammer tension, resulting in higher gas output, i.e., more power fps.

Test your build with just the Recoil spring first, upgrading the hammer spring means your slide will need to work harder in order to cock the hammer.