Have you tried to shoot the Luger with the new Mec-Gar mag in place? Are you just trying to check it's functioning by manipulating the toggle train by hand? What ammo are you trying to cycle through your Luger?
Not only Lugers, but other autos as well, at times will not function 100% correctly with hand cycling. You might want to take you luger and new mag to the range and give it a try.
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