T8 60+70 Degree Hop Up Bucking with Flat Nub for Marui GBB

T8 60+70 Degree Hop Up Bucking with Flat Nub for Marui GBB Rubber Construction Include 2x Hop Up Rubber (60 & 70 Degree) Design For Upgrade the Original Parts With nubs designed for use with flat hop style hop-up chamber Suitable For Tokyo Marui M4 MWS Series Airsoft Gas Blow Back GBB Rifle Airsoft Guns