FN 509 Compact 12-Round Extended Magazine 9mm Luger FDE/Black

The FN 509 Compact 12-round extended magazine transforms the standard 10-round capacity into a more substantial grip platform. This factory FN magazine features an extended floorplate that adds grip length while maintaining the compact profile essential for concealed carry applications.

What Makes This Different

Unlike aftermarket alternatives, this factory FN magazine maintains the exact tolerances and feed geometry of the original equipment. The extended floorplate adds approximately 0.75 inches to grip length, providing full three-finger purchase without compromising concealability. Steel construction with polymer follower ensures consistent feeding across various ammunition weights and profiles.

Key Features

• 12-round capacity increases firepower by 20% over standard magazine
• Extended floorplate adds grip surface for improved control and comfort
• Factory FN construction maintains original reliability standards
• Black polymer body with Flat Dark Earth floorplate matches FDE frame variants
• Steel internal components resist deformation under repeated loading
• Witness holes allow quick visual ammunition count verification
• Drop-free design ensures positive magazine changes under stress

Field testing demonstrates reliable function with ball, hollow point, and +P ammunition loads. The extended grip surface reduces muzzle flip during rapid fire sequences, particularly beneficial for competitive shooting and qualification courses. Corrosion-resistant finish withstands exposure to moisture and cleaning solvents without degradation.

Technical Specs

• Capacity: 12 rounds of 9mm Luger
• Material: Steel body with polymer follower and floorplate
• Finish: Black polymer with FDE extended floorplate
• Compatibility: FN 509 Compact pistols only
• Overall length: Approximately 4.8 inches with floorplate
• Weight: 3.2 ounces empty
• Country of origin: Belgium
• Manufacturer part number: 20100376

This factory magazine eliminates the reliability concerns associated with modified or extended aftermarket options. The additional capacity and improved ergonomics make it an essential upgrade for FN 509 Compact owners who demand maximum performance from their platform.