My FNS9 fell recently barrel first onto a tile floor. The muzzle end of the barrel into the crown & possibly into the rifling was damaged as a result. The fact it didn't go off on impact is a testament to the internal safeties!
Thankfully, I inspected it before firing & noticed the damage. While I don't think firing it would be a safety issue, it would definitely affect accuracy.
I'm sending it back to FNH this week for an estimate. Just a reminder to inspect your guns after potential damage & before firing at the range!