Glock 21, 21SF, 41 Gen 4 Magazine 45 ACP 13-Round Polymer Black

The 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. It's double cut magazine body also works with a reversed magazine catch on Generation 4 Glock pistol models. FeaturesHardened metal encased in durable polymer constructionViewing windows for visual confirmationDouble-stack designMetal magazine springStandard black polymer base plateBlack follower