AMG Recoil Spring For Umarex/ VFC HK416/ M4 GBB Airsoft (Winter Use)

AMG Recoil Spring For Umarex/ VFC HK416/ M4 GBB Airsoft (Winter Use) Metal Construction Airsoft Recoil Spring Design For Replace the Original Internal Parts Winter Use Suitable For Umarex/ VFC HK416/ M4 Gas Blow Back GBB Airsoft Rifle