G&P 42mm Outer Barrel Base (16M) for Marui M4A1 MWS GBB Rifle

G&P MWS 42mm Outer Barrel (16M) Metal Construction ONLY For Marui M4A1 MWS Gas Blow Back GBB Rifle ONLY Fit For Outer Barrel Extension (16M) (BRL069A~BRL069N) 14mm Anti-Clockwise