Agree we need to know why. Is there one? Want to see it!
I can just barely imaging a SIG (BDA as sold in the US) with a new barrel and some extractor fussing maybe, appearing to be a 10mm factory gun. There was a small period where it was popular as a caliber but there were not many Delta Elites, the Smiths were rare due to FBI sales (and QA issues) and so on, and no one could find a BREN TEN for love or money, so IIRC there were conversion barrels and custom work on others. Seen a handful of other Colts with aftermarket 10 mm barrels since then on sale shelves, etc.