FN America FN 509 Compact Extended Floorplate Pistol Magazine 9mm Luger 12 Round Black 1 Pack Steel 12RD. It features a stainless steel body with a flat black finish high visibility anti-tilt follower and extended floorplate. Note: This mag will not work with FNS or FNX pistols. Specifications for FN America FN 509 Compact 9mm Luger 12 Round Extended Floorplate Pistol Magazine: Manufacturer: FN America Gun Make: FN Herstal Caliber: 9mm Luger Magazine Capacity: 12 Round Color: Black Fabric/Material: Stainless Steel Package Contents: FN America FN 509 Compact 9mm Luger 12 Round Extended Floorplate Pistol Magazine FN America 20100375-12RD: FN 509 Compact Extended Floorplate Pistol Magazine 9mm Luger 12 Round Black 1 Pack Steel