MAG SLEEVE FN 509M 9MM 17RD SLEEVE FOR 17RD MAG | BLACK Manufacturer Model Number: 20-100355 Manufacturer: FN Model: FN 509M Magazine Sleeve Caliber: 9mm Type: Accessory-Magazines Item Type: Accessory Shipping Weight: 0.05 Feature: Sleeve For 17 rd. Magazine Optic Adjustable Objective: false Optic Reticle Illuminated: false