The FN 509 is indeed a popular choice among firearm enthusiasts, known for its reliability and durability. Here’s a summary of its key features based on the information you provided:

• Type: Striker-fired handgun
• Slide Material: Stainless steel with ferritic nitrocarburizing finish
• Frame Material: Polymer
• Color Options: Available in black and flat dark earth (FDE)
• Barrel Length: 4.0 inches (100 mm)
• Slide Serrations: Serrations on both the front and back of the slide for easy manipulation
• Capacity: 17+1 rounds
• Caliber: 9mm

These features make the FN 509 a versatile and reliable firearm suitable for various applications, including self-defense and recreational shooting.