G&P Roller Bolt with MWS 6 Postion Buffer Tube for Marui M4A1 MWS GBB Rifle

G&P Roller Bolt with MWS 6 Postion Buffer Tube for Marui M4A1 MWS GBB Rifle Aluminum Construction Include GBB Milspec Buffer Tube & Roller Bolt 6 Position Tube Suitable For Tokyo Marui M4 MWS Series Airsoft Guns Gas Blow Back GBB Rifle