This is a factory original from FN. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation.
Keeping a few extra factory magazines around is never a bad idea. Extra magazines save loading time at the range and also serve as a backup to your primary magazine when seconds count, and reloading is not an option.
*Separate sleeve required for use on the 509 Midsize or Compact not included.
UPC Code: 845737010089
Manufacturer: FN America
Manufacturer Part #: 20-100346-1
Fit: FN 509