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.
GLOCK, OEM Plus Two Magazine Extension, Does Not Include Mag Insert, 9MM, 40S&W & 357 SIG, Black, Not G43, Must Purchase OEM Magazine Extension Insert (GLSP07165) Separately, Packaged
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.