Guns Modify High Durable SMG / GBB Hop Up Rubber (70 Degree)

Guns Modify High Durable SMG / GBB Hop Up Rubber (70 Degree) Rubber Construction 70 Degree Design for Replace the Original Hop up rubber Suitable for Marui Gas Pistol/ Rifle, WE Gas Rifle, KJ Works Gas Rifle, Umarex (VFC) Gas Rifle