Received a Manton bore last week. I was surprised to learn that the right lock must be cock at least once before the left lock can be cocked. When the right hammer is cocked, the rear trigger is "set" (moves forward) and allows the left hammer to engage. Without this, the left hammer can be thumbed back but no full or half cock can be felt. The right lock can be left cocked or at half cock or lowered backed down and the left hammer will engage. Is this by design or is something wrong? Very repeatable. Anyone else hear of a set up like this? The locks have stalking safeties. Will get some opinions in Tulsa this weekend. Thanks in advance.