Owners of .40 S&W handguns are often left behind when it comes to extended aftermarket magazines, but not this time! For the huge market of firearm enthusiasts who have .40 S&W Springfield Armory XDs, this extended magazine makes it possible to get more range practice in with each reload, while also providing an extended option for back-up use. The Springfield Armory XD-40 steel magazine is designed for use with .40 S&W models only and have a magazine body made from heat-treated carbon steel. The magazine is treated with a black-oxide finish that combats corrosion and premature wear. Inside each Springfield Armory XD-40 steel magazine, you'll find a spring formed from heat-treated chrome-silicon wire, as well as an injection-molded follower. The magazines are available with a 20-round capacity and are made in the USA.