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I semi-fixed this problem in a G19 a while ago... One of the sears or the hammer was just worn down too much so that it wasn't catching during the quick blowback, but it would catch on a slow manual cock. I had to file another part so that it would catch more easily, but I wouldn't recommend that as it was really just a stop-gap solution. Open the gun up, look at the hammer assembly, figure out what's worn and replace it.
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