FN 503
- Type: Striker fired, recoil operated, semiautomatic
- Cartridge: 9mm
- Capacity: 6+1 rds.; 8+1 rds.
- Barrel: 3.1 in.
- Overall Length: 5.9 in.
- Weight: 1 lb., 5 oz. (with unloaded flush-fit magazine)
- Width: 1 in.
- Height: 4.4 in.
- Finish: Black nitride (steel)
- Trigger: 5 lbs., 8 oz. (tested)
- Sights: Three dot; front and rear drift adj. for windage only