It would be worth verifying that there are not wear / headspace issues with the gun. Is there much forward / rearward breech block play when the breech is closed on an empty chamber?
What is the spec of the recoil spring? There were a number of different resistance levels in these springs (thicker wire / number of coils). These are detailed in our FAQ document along with the versions of the Luger they were used in.
Is the extractor well clean, allowing the extractor to yield the casing when it hits the ejector? Is the contour of the extractor claw correct?
Are you seeing any peening on the area where the toggle strikes the frame during cycling?
It's a Mauser frame. Is it a matching gun?
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