GLOCK OEM Magazine, 380ACP 6 Rounds, Fits GLOCK 42, Grip Extension, Cardboard Style Packaging, Polymer, Black MF08833 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.