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Bill, I've checked the UPC without finding any info on the sights please contact customer service staff via LiveChat (available from 9AM to 9PM 7 days a week), the "Contact Us" tab at the top of the page, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday). If you found this helpful please click best answer, Thanks!

Bill, this particular model comes with "Fixed 3-dot Night Sights (LE only)". https://fnamerica.com/products/pistols/fn-509/ - You can verify this at FN Product Information: Phone: 703-288-3500

These will have 3 dot luminescent dovetail sights. The night sight model is 719018776.