New for 2021: FN 509 Compact Pistol Models Expanding the company's pistol line to offer more guns to the concealed carry market, FN this week announced the new The new 9mm double-stacks, available in black and flat dark earth, offer up to 15-round magazines in a gun that runs about as long as a Glock 26 sub-compact. Overall length is just 6.8 inches with a 3.7-inch barrel. Shipping complete with low-profile iron sights, the FN 509 Compact tips the scales at 25.5 ounces. Offered in both black and FDE, the new FN 509 Compact pistols have a high-visibility front sight and blackout rear. (Photo: FN) The guns ship with included 12- and 15-round magazines as well as two interchangeable backstraps to adjust the grip fitment. (Photo: FN)