GLOCK OEM Magazine, 40 S&W, 13 Rounds, Fits GLOCK 23, Cardboard Style Packaging, Black, Orange Follower, Gen5 65281 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 to the last shot.