ProWin Release Valve for Prowin Model 17/ 18 / Hi-Capa / MWS M4 GBB Maagzine

ProWin Release Valve for Prowin Model 17/ 18 / Hi-Capa / MWS M4 GBB Maagzine Designed to take the pressures of prolonged green gas use Suitable For Model 17/ 18/ Hi-Capa/ MWS M4 Series Airsoft Gas Blow Back GBB Magazine