The FN(R) 509 Compact MRD is a compact semi-automatic pistol chambered in 9mm with a 3.7 in barrel and 10+1 capacity. Its black polymer frame is paired with a cold hammer-forged stainless steel barrel optics-ready slide and all-black co-witness iron sights. Fully ambidextrous controls interchangeable backstraps and enhanced grip texturing support concealed carry and personal-protection use.Key FeaturesCompact striker-fired semi-automatic pistol9mm chambering3.7 in cold hammer-forged stainless steel barrel10+1 round capacityFN Low-Profile Optics Mounting SystemAll-black co-witness iron sightsFully ambidextrous operating controlsEnhanced grip texturingInterchangeable backstrapsMIL-STD-1913 accessory railFN(R) is known for producing firearms built around military heritage modern engineering and dependable performance across professional defensive and sporting applications. The brand is widely recognized for combining durable construction practical innovation and refined manufacturing standards across its handgun and long gun lineup. FN(R) firearms remain well regarded by shooters who value reliability functional design and proven real world capability.