Where is the serial number located on P99s?

At least for those imported into the US, the serial number is located in four places: on the right flat of the barrel hood, on the right side of the slide (immediately under the serial number on the barrel hood), on the rear of the frame, and under the grip insert on the frame. That is, the frame actually bears the serial number twice, one visible and one hidden. For the US, the only one that matters to the ATF is the visible one on the frame.

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