FN 509 Compact 12rd Extended Magazine 9mm Luger Black Steel

The FN 509 Compact 12rd Extended Magazine transforms the standard capacity of your FN 509 Compact pistol, adding crucial rounds while maintaining the firearm's concealable profile. This factory magazine features an extended floorplate that provides additional grip surface and ammunition capacity.

What Makes This Different

Unlike aftermarket alternatives, this FN factory magazine maintains the exact tolerances and quality control standards of the original equipment. The extended floorplate adds approximately 0.5 inches to overall grip length while increasing capacity from the standard 10 rounds to 12 rounds. Factory specifications ensure reliable feeding and consistent lockback function that aftermarket magazines often struggle to match.

Key Features

• 12-round capacity with extended floorplate design
• Black steel construction with corrosion-resistant finish
• Factory FN manufacturing ensures perfect fit and function
• Extended grip surface improves control and handling
• Compatible exclusively with FN 509 Compact pistols
• Witness holes for quick round count verification
• Heat-treated steel spring for consistent tension

The extended magazine performs reliably across temperature extremes and maintains consistent feeding with various 9mm ammunition weights from 115 to 147 grains. Law enforcement agencies and competitive shooters rely on these magazines for duty carry and USPSA competition where the additional capacity provides a tactical advantage. The steel construction resists deformation under stress and maintains dimensional stability after thousands of loading cycles.

Technical Specs

• Capacity: 12 rounds of 9mm Luger
• Material: Black steel body with polymer floorplate
• Overall length: Approximately 4.8 inches
• Weight: 3.2 ounces empty
• Compatibility: FN 509 Compact pistols only
• Finish: Matte black corrosion-resistant coating
• Country of origin: Belgium
• Part number: FN 20100375

This factory magazine represents the most reliable capacity upgrade available for the FN 509 Compact platform. Professional users who depend on their equipment choose OEM components for their proven track record of consistent performance.