The Phase 5(TM) Extended Bolt Release v1 (EBRv1) is a two-piece heat-treated add-on. When mounted to your standard Mil Spec bolt catch, the EBRV1 helps clear jams and double feeds efficiently, and allows quicker magazine reloads and faster bolt operation. This release allows the shooter to swipe the toggle in the downward motion with the trigger finger to release the bolt and press the toggle in an upward motion to lock the bolt open.*Compatible with Mil Spec AR15 bolt catches