GLOCK 17/22 MAG EXT +5/+4 BLK 3111 | +5 9MM | +4 .40 Manufacturer Model Number: 3111 Manufacturer: Warne Model: Glock 17/22 Magazine Extension Type: Accessory-Magazines Item Type: Accessory Finish: Black Shipping Weight: 0.15 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