At least it wasn't a HK P9S! Those roller delayed blowback pistols are complicated. Took me a couple days to get mine back together.
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Tip of the hat to you for taking on the HK PS9. I don't believe that there is anyone in the country qualified to work on these. Although not in business, I am a certified gunsmith, and would avoid this one. I see a US HK Armorer as the only option. A very expensive one at that.