I have a friend who owns a Browning Citori over under with a release trigger. My understanding is that a release trigger is for shooting sporting clays and need to fire two rounds in rapid succession. When you first pull the trigger nothing happens. Then when you release the trigger the gun fires. Then finally the second round can be fired on the next pull of the trigger. This allows two quick shots with a release, then a pull. Is this correct oris there another reason for a release trigger? Has anyone here ever used one? What are your thoughts? Do you purchase the gun this way or is this only done by a gunsmith after you purchase the gun?