I found on a couple of my aftermarket mags that the mag catch slot in the mag body was not shaped correctly for the mag catch. It was close, but not close enough and would release the mag when firing the luger. A very small amount of work with the correct needle file and the mag notch matched the mag release perfectly. They no longer fall out when firing. It might be something for you to check if you continue to have problems with your mags.
You may also want to remove the left grip(very carefully) and relieve a bit of wood in the area of the mag catch spring.
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