Shogun17, welcome to the forum. Lots of knowledgeable folks here.
You have what may be the ultimate "mixmaster" of Lugers. The receiver and barrel are from an Imperial German Navy Luger manufactured by DWM during WW1. The side plate is from Erfurt - also WW1 - and your toggle train was made by Mauser during the Nazi era. The frame is also Mauser made.
From your pictures it looks as if it is not assembled correctly. Remove the magzine, lower the take down lever (locking block) and remove the side plate. Slide the upper forward and note the "S" hook hanging underneath near the back. Pull the upper far enough for the S hook to clear the main spring hook which will look flat and have a slot in the center. Tilt the frame upward and slide the upper rearward making sure that the S hook slides into the slot in the main spring hook and engages the S hook. Press the muzzle against a soft but firm surface (towel on a table top) forcing the upper rearward against the spring pressure. Replace the side plate and lock it in place with the take down lever. It should now function properly.
Below you can see the S hook and below that the main spring hook that the S hook must engage.
