Glock 23 Gen 5 Handgun Magazine 40 S&W 13/rd D991D0BF GL. The high quality spring and follower ensure reliable feeding from the first round fed by a fully compressed spring down to the last shot. Specifications for Glock 23 Gen 5 Handgun Magazine 40 S&W 13/rd D991D0BF: Manufacturer: Glock Caliber: .40 S&W Fabric/Material: Polymer Features of Glock 23 Gen 5 Handgun Magazine 40 S&W 13/rd: Hardened steel insert Reliable feeding Fully compressed spring High quality spring Package Contents: Glock 23 Gen 5 Handgun Magazine 40 S&W 13/rd 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. GL47737