ProMag FNHA6 17-Round 9mm Magazine for FN 509 Blued Steel

The ProMag FNHA6 extends your FN 509's capacity to 17 rounds of 9mm ammunition, providing additional firepower when standard capacity isn't enough. This aftermarket magazine features blued steel construction for enhanced durability and corrosion resistance.

What Makes This Different

Unlike polymer alternatives, the FNHA6 utilizes blued steel construction that withstands repeated loading cycles and environmental exposure. The 17-round capacity exceeds factory magazine limitations while maintaining reliable feeding geometry. Heat-treated steel components resist deformation under spring pressure, ensuring consistent performance across thousands of loading cycles.

Key Features

• 17-round capacity increases ammunition availability by 27% over standard magazines
• Blued steel body construction provides superior durability compared to polymer alternatives
• Heat-treated internal components resist wear and maintain spring tension
• Compatible with FN 509, 509 Compact, and 509 Midsize pistols
• Anti-tilt follower design ensures smooth cartridge presentation
• Removable floor plate allows for easy cleaning and maintenance
• Witness holes provide visual ammunition count verification

Range testing demonstrates reliable cycling with various 9mm ammunition weights from 115 to 147 grains. The steel construction maintains dimensional stability during rapid fire sequences, while the anti-tilt follower prevents feeding malfunctions common in extended magazines. Competition shooters benefit from the increased capacity during USPSA Limited division matches, while the robust construction suits duty and training applications.

Technical Specs

• Capacity: 17 rounds of 9mm Luger ammunition
• Construction: Blued steel body with steel internal components
• Compatibility: FN 509, 509 Compact, 509 Midsize pistols
• Overall length: Approximately 5.2 inches
• Weight: 4.8 ounces unloaded
• Finish: Traditional blued steel finish
• Country of origin: United States

The FNHA6 addresses capacity limitations inherent in factory magazines while maintaining the reliability standards expected from duty-grade equipment. Steel construction ensures long-term durability that justifies the investment for serious shooters.