ProMag FN 509 20-Round 9mm Magazine

This ProMag magazine is a 20-round replacement designed for use with FN 509 9mm pistols. The magazine body is constructed from heat-treated steel and is supplied with an injection-molded follower and a spring formed from heat-treated chrome-silicone wire. It is listed as made in the USA. Compatibility is specified for FN 509 pistols, including mention of FN 509 Compact compatibility by the manufacturer.

Key Specifications

• The magazine holds 20 rounds.
• Designed for 9mm Luger (9×19) pistols, fitting FN 509 models.
• The magazine body is constructed of steel.
• Includes an injection-molded magazine follower for consistent operation.
• The magazine spring is formed from heat-treated chrome-silicone wire.
• Manufacturer lists dimensions as 1.20 x 1.75 x 6.15 (manufacturer spec).
• The product is listed as Made in USA.

Built to provide a straightforward spare magazine option for FN 509 owners, this ProMag unit focuses on durable materials and proven internal components. Its steel body and specified spring/follower combination make it suitable for range use, maintenance of a defensive rotation, or as a serviceable backup magazine for responsible, informed shooters.