Guarder Airtight Rubber for Marui M4 MWS GBB

Guarder Airtight Rubber for Marui M4 MWS GBB Rubber Construction This is a great upgrade part that improves the air seal for your magazines and is better suited to deal with prolonged green gas use Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle