UAC Aluminum Lightweight Bolt Carrier for Marui M4A1 MWS (Type B)

UAC Aluminum Lightweight Bolt Carrier for Marui M4A1 MWS (Type B) Aluminum Construction Skeletonized Design For a Faster Shooting Cycle and Rate of Fire. Suitable For Tokyo Marui M4A1 MWS Series Airsoft Gas Blow Back GBB Rifle