The top lever acts on the lock which is very precisely fitted to the barrel lugs. A certain reserve of closure has been designed into the top lever pin so that perfect locking of the barrels can be achieved for many years. For this reason, it is harmful to the top lever pin and lug bearing surfaces to assist the return of the top lever with the thumb when closing the gun; the lever should be allowed to return of itself without attempting to push it any further. The angle made by the top lever with respect to the barrels is normal and indicates that there is a locking reserve.
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