The Guns Modify zinc alloy hop up base is a high quality upgrade over the stock part found in the out of the box gun. The set is designed to give finer tuning to the hop up and reinforce any short comings the stock one might have.
Compatibility:
Tokyo Marui M4 MWS GBBR
Includes:
x1 Guns Modify Zinc Alloy Hop Up Base and Adjuster Set for Tokyo Marui M4 MWS GBBR
Compatibility:
Includes: