The FN 15® Patrol Carbine, the latest addition to FN's tactical law enforcement line, offers the same features as the standard FN 15® Carbine model but has a 16" alloy steel, button broached, chrome-lined barrel, Samson flip-up rear sight for compact and reliable back-up sighting and a Midwest Industries drop-in 7" quad rail hand guard for increased adaptability and front gripping options.