Tokyo Marui M4A1 Carbine (ZET System) GBB Barrel Base Nut

Tokyo Marui M4A1 Carbine (ZET System) GBB Barrel Base Nut Design For Replace the Orginal Parts #MGG2-13 #MGG2-14 Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle