If you own a Walther P99QA, can you please tell me whether it has the "eagle over N" proofmark on the slide (right-rear, behind the serrations), the barrel (the portion that is exposed through the ejection port), and frame (on the right side, under the accessory rail)?
Yes, the 3 spots you mentioned have "eagle over N" marks, plus the same serial number on the barrel, slide and frame. Mine is 2000 model, printed "Walter USA LLC, Springfield MA", from Earl's.
