The FN 503 is a polymer frame striker-fired subcompact semi-automatic pistol manufactured in Columbia, South Carolina, by FN America, a division of FN Herstal.
Introduced in March 2020, the FN 503 is chambered in 9ÃÂ19mm Parabellum and is intended for concealed carry.
As of August 2023, the FN 503 was discontinued.
The FN 503 is a striker-fired handgun with a stainless steel slide with the "design, performance and reliability standards" of the FN 509.
Subcompact in size, its overall length is with a barrel length of and a width of .
The three-dot iron sights are low-profile, while trigger pull averages .
Magazines are either 6-round with a pinky extension or 8-round with a grip sleeve.