Each GLOCK magazine is constructed from a hardened steel insert encased in high tech polymer to protect the magazine and prevent deformation, even when dropped from a great height. The high quality spring and follower ensure reliable feeding from the first round fed by a fully compressed spring down to the last shot. Product Features Constructed of hardened metal encased in durable polymer Viewing windows for visual confirmation Double-stack design Metal magazine spring Orange follower Product Specifications Manufacturer: Glock Model: 17 Caliber: 9mm Capacity: 17 rds Finish: OD Green Standard Magazine for: G17 GEN5; G34 GEN5 MOS Also fitting: G19 GEN5