Guns Modify Zinc Alloy Hop Up Base and Adjuster Set for Marui M4 MWS GBB

Guns Modify Zinc Alloy Hop Up Base and Adjuster Set for Marui M4 MWS GBB Zinc Alloy Construction The set is designed to give finer tuning to the hop up and reinforce any short comings the stock one might have Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle