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Anti-scratch and Anti-freeze
especially the variable chamber is a very important
Metal Constructed Magazine accommodate 6mm airsoft plastic pellets
and bolt release/bolt lock-back
Suitable For M4 Standard Series AEG Rifle
Tokyo Marui M4A1 Carbine (ZET System) GBB Upper Receiver tm m4 mws Anti-scratch and Anti-freezeTokyo Marui M4A1 Carbine (ZET System) GBB Upper Receiver Design For Replace the Original Upper Receiver #MGG2 94 #MGG2 100 Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle
