Guns Modify High Durable SMG / GBB Hop Up Rubber (60 Degree)

Guns Modify High Durable SMG / GBB Hop Up Rubber (60 Degree) Rubber Construction 60 Degree Design for Replace the Original Hop up rubber Suitable for Marui Gas Pistol/ Rifle, WE Gas Rifle, Umarex (VFC) Gas Rifle