FN 503 9mm Micro Single-Stack Pistol, 3.1 in Barrel, Black, Striker-Fired — Excellent Condition with 6- and 8-Round Magazines, Box and Case
This FN 503 is a micro, single-stack 9mm introduced in 2020 and later discontinued by FN. Assembled in Columbia, South Carolina, it pairs a 3.1-inch nitride-treated steel barrel with a slim profile measuring 0.9 inches at the slide and 1.1 inches overall. It features low-profile three-dot sights and comes in excellent condition with a clean, mirror-finish bore. Included are both 6- and 8-round factory magazines, the original box, soft case, and manual.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This pistol shows little evidence of prior use. The bore is clean and shiny.
What’s Included
- FN soft-sided zip case
- FN factory cardboard box
- Manual
- 1x 6-round FN 503 steel single-stack magazine with flush/pinky-extension baseplate
- 1x 8-round FN 503 steel single-stack magazine with extended grip-sleeve baseplate
The FN 503 is a striker-fired, micro-size 9mm built for a slim footprint. Its slide measures 0.9 inches wide, with an overall width of 1.1 inches, aiding concealment while maintaining a full, usable grip with the included extended magazine.
The 3.1-inch steel barrel is nitride-treated, and the slide carries rear serrations only with a durable black finish. There is no dedicated loaded-chamber indicator window; status checks can be performed via a press-check or by viewing through the ejection port.
Low-profile, three-dot iron sights are dovetailed front and rear, using FN 509-pattern dovetails for straightforward sight changes. The sight radius is 5.1 inches for a clear, consistent sight picture.
Controls include a left-side magazine release and a polymer trigger shoe with a central safety tab. Internal safeties consist of a striker block and a trigger disconnect lever. The black polymer frame features aggressive textured grip panels with FN oval medallions. Capacity is 8+1 with the extended magazine or 6+1 with the flush/pinky-extension magazine. This model omits an accessory rail and was assembled in Columbia, South Carolina, USA.