Z-Parts Steel Gas Block for Umarex (VFC) HK416 SMR GBB Airsoft Rifle

Z-Parts Steel Gas Block for Umarex (VFC) HK416 SMR GBB Airsoft Rifle Steel Construction Airsoft Gas Block Design For Upgrade the Original External Parts Suitable For Umarex (VFC) HK416 SMR Gas Blow Back GBB Rifle Airsoft Gun