The 99401 is a steel frame with black poly coat finish and a DA/SA trigger. They were imported in limited numbers starting around 2018. Don’t recall a SS version, but with my memory that’s not eliminating anything. Could also be a after sale refinish like hard chrome or similar. If it’s factory it should have a different SKU. Of course it could have been a special factory order from a US distributor and not part of the regular catalog. Is it a polished or matte SS finish? Picture would be nice.