So, managed to find some info on the Micro Sight. It appear the sight was originally made for Ruger Flat top revolvers. The base that is on the Luger appears the be a custom manufacture, which would be quite easy to replicate. Bowen Custom Arms appears to make a clone to fit that pistol, and could easily be re-purposed to fit a mount on a Luger. I must say, that is by fat the slickest sight mount i have yet seen on a Luger.
The Bowen model also appears to be an adjustable fixed sight. It uses opposing screws to lock the adjustments in place, as opposed to normal click and spring adjustments.
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