This is an OEM 13-round .40 S&W Glock 23 Gen 5 magazine. The Gen 5 Glock 23 .40 S&W 13-round magazine is a genuine Glock factory magazine engineered to deliver dependable service for any shooting application. Constructed of reinforced polymer with a steel lining, this G23 13-round mag is built for rugged durability and lasting performance in harsh and demanding conditions. The high-visibility orange polymer follower and steel spring work in tandem to deliver optimal cartridge alignment and smooth, jam-free feeding performance for superior reliability. Factory-drilled and numbered witness holes make for easy, at-a-glance round counts, and the removable baseplate adds a layer of shock resistance and offers easy disassembly for cleaning and maintenance. To top it off, this Glock .40 compact pistol magazine offers a convenient flush fit for comfortable carry and a smooth, snag-free draw.