Steve, if what you are saying about moving the safety rearward and forward past "S" to select a barrel, that would be the early type Miller One-Trigger, but since you have double triggers it is what redocdrew explained. Pulling the safety rearward lets you break the gun open without the safety going back to "safe". Forward pushing the safety past "S" lets you break the gun open and the safety will return to "S" (safety)