The 509 Compact MRD is astriker-fired firearm. It’s available in 9mm, features a double-action trigger (more on this below), and an interchangeable grip. This last detail is fantastic right out of the box, for most shooters, at least. ...
We compare the duty-sized FN 509 vs VP9 which is in the same category. Both have short slides and long grip but many other key differences.