Depending on which era Luger you have, the blowback through a primer perforation could blow out the rear of the breech block where the firing pin retainer locks in. Check that for damage. The problem could be a headspace issue. Either where the chamber ledge fits up against the cartridge front edge, or through some problem in the toggle train. I wouldn't shoot a pistol that does this until the cause is established. Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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