You do not need to remove the screw in the forearm (the wood grain checked hand grip situated under the barrels). Gently pull down (away from the barrels) on the front of the forearm. After you can visibly see the hook attached to the barrel slide the forearm towards the front of the gun. It should be easy to do as it is only held on by tension. After this is detached you will find one of the serial # just aft of the hook. Now flip the break down lever as if you were going to load it and push the barrels aft and up over the hammer. You will find the second serial # on the surface that the barrel rests on when it is closed. Reassambel in reverse order.