M&P 9/40 MAG EXTENSION FDE 3313 | +5 9MM | +4 .40 Manufacturer Model Number: 3313 Manufacturer: Warne Model: S&W MP 9/40 Magazine Extension Type: Accessory-Magazines Item Type: Accessory Finish: Dark Earth Shipping Weight: 0.06 Feature: +5 9MM | +4 .40 Mag Extension Feature: 6061 T6 Aluminum Billet Feature: Type 2 Anodized Finish Optic Adjustable Objective: false Optic Reticle Illuminated: false