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problem with self-cock

  1. HK HANDGUN TALK
    Just fired my H&K 9mm for the first time. Bought it used. When I fire it, it self-loads just fine, but self-cocks only about 3 out of 4 rounds, on average. Very disturbing. Does anyone know what might be causing this? Some addiitonal background information: It was a law enforcement trade-in that...
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