G&P Blank MWS Forged Aluminum M4 Upper Receiver w/ Hop-Up Chamber for Marui M4A1 MWS GBB Length-(mm)_60.0 helpful guide that can be

helpful guide that can be used from the beginner to the more advanced

Suitable For Tokyo Marui MWS Gas Blow Back GBB Rifle

Built in steel QD cup

The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons

Design For Replace the Original Parts (Part# 03-1)

G&P Blank MWS Forged Aluminum M4 Upper Receiver w/ Hop-Up Chamber for Marui M4A1 MWS GBB Length-(mm)_60.0 helpful guide that can beG&P Blank MWS Forged Aluminum M4 Upper Receiver w Hop Up Chamber for Marui M4A1 MWS GBB Aluminum Construction Blank MWS Aluminum M4 Upper Receiver CNC Quick Release Hop Up Chamber (Patented) Suitabloe For Tokyo Marui M4A1 MWS Series Airsoft Gas BLow Back GBB Rifle