GLOCK 42 MAG EXTENSION +2 BLK 3131 Manufacturer Model Number: 3131 Manufacturer: Warne Model: Glock 42 Magazine Extension Type: Accessory-Magazines Item Type: Accessory Finish: Black Shipping Weight: 0.02 Feature: +2 Magazine Extension Feature: 6061 T6 Aluminum Billet Feature: Type 2 Anodized Finish Optic Adjustable Objective: false Optic Reticle Illuminated: false