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Approx how many rounds do you have through the gun?
Has this done it since it was new?
Are you running reloads? Or factory?
The first thing (if you have approx 5,000 rounds through it) would be to replace recoil spring.
Then, the tension of the extractor could be a little off.
If using reloads, are they on the hot side?
Can you post a pic of a casing showing the mouth and head stamp?
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)