Rocket Airsoft Gas Magazine Fill Valve 6.3mm - Gas Grenade

Rocket Airsoft Gas Magazine Fill Valve 6.3mm diameter. We're not really exactly sure what guns this will fit, but it does work perfectly 1:1 on 40mm gas grenades. Does not fit Marui, KWA, VFC, WE, KJW, Tanaka, etc. May fit in some other pistol or gas magazines. For use in green gas gun airsoft magazines/40mm grenades. SHS OEM