Norme's picture should help you identify the hold open that is activated by the magazine follower pushing the block upward and preventing the action from closing.
Is yours missing or possibly never there? If never there, you may have a frame manufactured in 1913 or before without the hold open installed. Lugers made without the hold open could be retrofit by the Erfurt factory and many were but some weren't. A 1918 Luger should have the hold open so it's possible that the upper and frame are from different Lugers. Pictures of your Luger would help; top, both sides, front of the frame etc.
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