Make sure the pistol is unloaded.
Remove the upper assembly of the pistol (receiver, barrel, toggle train assembly in one unit) from the frame. Do not disassemble it. With the upper assembly removed from the frame, pull up on the toggle knobs and retract the toggle train fully to the rear of the receiver/barrel assembly. Now move the breech block forward into battery by pressing down on the joint at the front/rear toggle links. If you meet no resistance as the breech block closes, then the sear bar is not engaging and holding the firing pin back as the breech block moves into battery. The firing pin has a tab on it's left side that engages the sear bar, and cocks the pin, as the breech block moves into battery. If you feel no resistance here, disassemble and inspect the firing pin and sear bar. Make sure the tab on the firing pin is not broken off, or the sear bar is not damaged.
If you feel resistance upon closing the breech in this manner, close it fully and hold the assembly in your hand with your thumb pressing down on the front/rear toggle joint to keep it in battery. Then press inward on the front end of the sear bar. This will release the firing pin - you should hear a click.
If that worked, again retract the toggle assembly fully, push it forward into battery to recock the action. Assemble the upper assembly back onto the frame. Assemble the trigger plate trying to make sure the bottom of the trigger lever is engaged in the slot at the top of the trigger, press in the trigger plate and lock it in with the takedown lever. Pull the trigger. If the firing pin will not release now, the problem is in the side plate assembly - more than likely a maladjusted trigger lever. This can be fixed by a good Lugersmith.
When you test the assembled pistol, make sure the thumb safety is disengaged. This would be the position that covers up the word "Gesichert".
Bob
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