This is a factory FN Herstal blued steel magazine for the FN Herstal FN 509. The maximum capacity for this magazine is 17 rounds.
Fabrique Nationale d'Herstal (French for: National Factory of Herstal) – self identified as FN Herstal and often referred to as Fabrique Nationale or simply FN – is a leading firearm manufacturer located in Herstal, Belgium, and is owned by the holding company Herstal Group which is owned by the regional government of Wallonia. FN America is the America subsidiary of FN Herstal; FN America was formed by the merger of FN's previous two American subsidiaries: FN Manufacturing and FNH USA.
The FN 509 is built on the proven architecture of the FNS Compact, FN made changes internally and externally to meet the rigorous performance standards of the MHS requirements and further developed the platform into the FN 509 with the help from industry experts.