That link says it has a 5% chance of passing. It never ceases to amaze me what these people are able to come up with while having no actual understanding of the firearms world.
Delmarva Sportsman's Association in Sudlersville hold monthly matches. I enjoyed shooting them when I had free time. Probably still a little but of a haul for you though.
I just did a quick google search for FNS9 milled slide and it looks like several companies offer the service for various prices. You would have to send the slide out, but it can be done.