Phase 5 Weapon Systems Extended Bolt Release V1, Black Finish EBRV1 When mounted to your existing bolt catch" the Phase 5 Extended Bolt Release (EBRV1) helps clear jams and double feeds efficiently during magazine reloads while allowing faster operation. The release feature allows the shooter to swipe the toggle in the downward motion with the trigger finger to release the bolt and chamber the next round" greatly decreasing reload time.