GunsModify 7003 T6 Aluminum CNC Speed Zero Bolt Carrier for Marui MWS M4 GBBR (Black) Gas Blow Back Rifle Kashima-coat of alumite is used

Kashima-coat of alumite is used for nozzle guide

System 7 Two Version

Bore-Up Chromium Plating Cylinder

Tokyo Marui H&K MP5K A4 PDW AEG

50 GBB Pistol

GunsModify 7003 T6 Aluminum CNC Speed Zero Bolt Carrier for Marui MWS M4 GBBR (Black) Gas Blow Back Rifle Kashima-coat of alumite is usedFor Marui M4 GBB CNC T6 Aluminum Construction (Lightweight) Suitable for Tokyo Marui M4 Series Airsoft Gas Blow Back GBB Rifle Ability to attach the added weight in its rear to increase felt recoil by the addition of more mass to increase inertial forces Suitable for Marui M4 GBBR CNC machined T6 aluminum construction Adjustable steel weight at rear end 140 gram weight Item Code: GM0221