[Ron Wood]

Your Luger has what is called a "relieved" sear bar (a modification to the design that happened around 1913). This feature allows the toggle to be opened far enough to safely remove a round from the chamber to clear the weapon, but not far enough to completely cycle the action. To be able to fully retract the toggle the safety must be in the "up" postion so that the GESICHERT marking is covered and the little silver "flag" that blocks the sear is retracted. If you cannot move the safety there is a pretty good chance that it is just gummed up after all of these years and bit of penetrating oil on the "flag" and the pivot point of the safety lever might free it up. To do this you will have to carefully remove the left grip. The carefully is underscored because it is very easy to break the grip panel just below the safety lever. Remove the grip screw and reach into magazine opening with your finger and lift up on the bottom of the grip panel just enough to clear the grip frame at the bottom, then gently pull the grip panel straight down until it is out from under the frame and safety lever. It may help to push in on the magazine release button to make it easier to pull the grip panel down.