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COWCOW Technology M6 Buffer Module for GBB Pistol (For 6mm Diameter Custom Guide Rod) cover Maruzen M870 Extension Custom BlackCOWCOW Technology M6 Buffer Module for GBB Pistol (For 6mm Diameter Custom Guide Rod) Highlighted features High quality anti oil rubber material 4 different hardness (45 55 65 75) in a package Well performance on shock adsorption Become a cushion to protect the slide against the frame Different combination to optimise the recoil for professional player For 6mm diameter custom guide rod **Important Notice** M6 Buffer Module is not suitable for original