FN HP-DA (Hi-Power Double Action)[1] is a 9mm semi-automatic pistol developed by Belgian Fabrique Nationale arms factory in Herstal.

The development of the BDA may have been a response to the original Hi-Power's shortcomings in the first Joint Service Small Arms Program tests conducted in the late 1970s.

[4][additional citation(s) needed] FN had the BDA ready for the 1983–1984 XM9 pistol trials to select a new sidearm chambered for the 9×19mm Parabellum cartridge that would equip all branches of the United States Armed Forces.

The production resumed in 1990, with the second/updated version produced with a newer-style frame safety, as well being made with a new manufacturing process.

The spring-loaded external claw extractor is mounted in the slide, while the fixed ejector is inside the pistol's frame.

The magazine release button, located aft of the trigger, can be configured for either right- or left-hand users simply by swapping out the push-button.

The pistol is aimed using fixed iron sights with contrasting dots – a front blade and dovetailed rear notch.

[citation needed] The HP-DA is chambered for the 9×19mm Parabellum cartridge, but a 9×21mm version is also available for those countries where military calibers (such as the 9×19mm) are prohibited for civilian use.[where?