Max,
It appears that you have a very nice 1906 Commercial Luger in 9mm. It is difficult to tell exactly from the photos because they are not very close up. Closer photos and the serial number would help very much in better identification. Is it 9mm?
The magazine in your gun is a later WWII magazine. It looks like it does not fully lock into the gun, so perhaps the catch in the magazine body is worn or just does not work well in your early Luger. Try Norm's suggestion of pushing up on the magazine to see if that works.
Good luck and thank you for the photos. It looks like a very nice example and more photos would be appreciated.
Ron
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If it's made after 1918...it's a reproduction
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