VFC KAC Gas Block for M4/ MK12 AEG/ GBB Airsoft

Key Feature Aluminum Construction Airsoft Gas Block Suitable For Umarex (VFC) M4/ MK12 AEG /GBB Airsoft Rifle Also fit for VFC M4 Thick Outer Barrel Not Compatible with M733/ XM177 series thin barrel *Requires technical experience for installation