In the market of expanded capacity magazines for Glock®handguns, most manufacturers focus on 9mm options at the expense of other calibers that continue to be popular with today's handgun owners. One of those often-forgotten calibers is the .40 S&W, and these Glock®22/23/27 polymer magazines offer expanded options for more mags, as well as an increased capacity option that holds up to 27 rounds. Each Glock®22/23/27 polymer magazine is built for use with the .40 S&W cartridge, and the magazine body is constructed using DuPont's proprietary Zytel polymer, which has been proven to be durable and long-lasting. Constant spring pressure is provided by a heat-treated chrome-silicon wire spring. The magazine are all made in the USA and feature an all-black finish.