Built on the bones 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 help from industry experts. Over the course of development, the platform has been put through the rigors of 1 million rounds of testing for reliability, ammunition compatibility and durability.
Aesthetic changes to the platform include more aggressive cocking serrations, enhanced grip textures, guarded controls and recessed target crown on the barrel. Critical internal components were completely redesigned to ensure maximum performance to meet FN’s demanding standards. The FN 509 is currently shipping to FN distributors in two commercial SKUs, available at retail in early May, and two law enforcement SKUs, available in early June. Other options like manual safety models will be made available at a future date.
Read the rest of the article: https://www.americanrifleman.org/articles/2017/4/17/fn-america-launches-mhs-entry-the-509-9-mm-pistol/