FN 509 17rd 9mm Magazine — Black Stainless Steel/Polymer

The FN 509 17-round magazine is a factory OEM magazine intended for 9mm centerfire pistols. It is described as constructed of heat-treated stainless steel with a black finish and features a steel wire internal spring and an anti-tilt polymer follower for dependable feeding. Numbered witness holes provide quick visual round counts.

Key Specifications

• The capacity is 17 rounds.
• The caliber is 9MM LUGER (9X19,9MM PARABELUM).
• Constructed of heat-treated stainless steel with a black finish, per manufacturer text.
• Includes a steel wire internal spring for consistent follower tension.
• Uses an anti-tilt polymer follower to promote reliable feeding.
• Features numbered witness holes for quick visual round counts.
• Application: CENTERFIRE PISTOL.
• Dimensions are listed as 1.35 X 2.65 X 5.45.
• Includes a Black Baseplate as an additional feature.
• Weight is listed as 0.25 (value provided by source).

This OEM magazine offers an industry-standard configuration for users seeking factory-spec magazines. Its combination of a heat-treated steel body, steel spring, and polymer follower with witness holes supports straightforward loading and day-to-day use in compatible FN pistols.