FN 503 9mm Micro Striker-Fired Pistol, 3.1 in Barrel, Stainless Slide, Black — Excellent Condition with 3 Magazines, Case & Box
The FN 503 is a micro 9mm designed for slim carry with verified FN features throughout. This example pairs a stainless-steel slide in black finish with a polymer frame and low-profile three-dot sights. It includes three factory magazines and both the original FN box and soft case. A recessed target crown, 1:10 RH twist, and a polymer trigger with integral safety blade round out a compact package manufactured in Columbia, South Carolina, USA.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Shows minimal evidence of prior handling or firing.
What’s Included
- Factory FN cardboard box (original)
- FN-branded soft zippered case
- FN owner's manual
- Two 8-round factory FN steel magazines (extended with grip sleeves)
- One 6-round factory FN steel magazine (flush or pinky-base type)
The FN 503 is a micro-size, striker-fired 9mm built around a stainless-steel slide with a black finish and a black polymer frame. It uses FN 509-pattern sight dovetails and comes equipped with low-profile three-dot iron sights, with a white-dot front for quick indexing.
The 3.1 inch barrel features a recessed target crown and a 1:10 RH twist. The polymer trigger with integral safety blade provides a straightforward, duty-style control set in a compact footprint.
Dimensions are efficiently scaled for concealment: 5.9 inches overall length, 4.6 inches in height, and 1.1 inches overall width (0.9 inch slide width). Unloaded weight is 21 ounces, giving the pistol a solid, controllable feel for its size.
Magazine configuration supports 8+1 capacity with the extended magazines, while the 6-round magazine offers a shorter profile. The left-side magazine release and skateboard-tape-style grip texture provide a confident, consistent interface.
Announced on March 17, 2020 as FN's slim single-stack 9mm, this U.S.-made example was manufactured in Columbia, South Carolina, and remains a clean, feature-complete micro pistol with factory accessories.