Crusader Forward Assist Button for VFC M4 / Umarex (VFC) HK416 GBB (Silver)

Crusader Forward Assist Button for VFC M4 / Umarex (VFC) HK416 GBB (Silver) Metal Construction If the bolt goes forward, it slides a BB into the chamber but if it fails to go into a fully forward position simply racking the charging handle again will not clear the previous BB Instead, you can push the bolt the rest of the way using the forward assist. Suitable For VFC M4 / Umarex (VFC) HK416 Series Airsoft Gas Blow Back GBB Rifle