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Hi Joshua and welcome. It is a mid-sized pistol and comes with Tritium Night Sights. The 3.7-inch barrel model is the "Compact" version as shown here: https://fnamerica.com/products/pistols/fn-509-compact/ ---------- Cheers, stay safe and enjoy!

It is a full size 509 and SKU shows it comes with night sights.

It is a full size 509 and the SKU indicates it comes with night sights.

Full size and includes night sights.

It is a full size 509 and includes night sights.