A Plus Airsoft Hop Up Rubber for VFC M4/ 416A5/ GHK M4 GBB Rifle

A Plus Airsoft Hop Up Rubber for VFC M4/ 416A5/ GHK M4 GBB Rifle Rubber Construction Hop Up Rubber Design For Upgrade the Original Parts More Durable Suitable For VFC M4/ 416A5/ GHK M4 Gas Blow Back GBB Rifle Airsoft Gun