The Dynamic Precision Speed Master - Competition Recoil Spring for Tokyo Marui Hi-Capa Series is a perfect replacement part for snappier recoil allowing the user to pull the trigger much quicker. Upon installing these you'll notice a much more smoother cycling per shot, please seek a professional to install if you have no experience in fitting one.
Disclaimer: All aftermarket upgrade parts require necessary skill or modification to install and assemble, please consult with your airsoft technician if needed.