From The Manufacturer/Wikipedia/People Smarter Than Us:
The FNS™-9 Compactoffers the same features as the standard models but have 3.6” barrels and is designed to be snag-free for better concealment and a faster draw. The front sight also has a larger dot for faster target acquisition. The FNS-9™ Compact comes with two 12-round and one 17-round magazine.