Phase 5 Weapon Systems Extended Bolt Release V3, Black Finish EBRV3 The Extended Bolt Release Version 3 was designed to be compatible with all mil spec AR-15/M16 receiver sets as well as many billet" side charging" and even left-handed weapons. The EBRv3 gives the operator the ability to reload quicker" clear jams more efficiently" and eliminates unnecessary hand movements during some operations by extending the lever into the trigger well for access on the right side of the weapon.