The Smith and Wesson Shield .40S&W 7rd extended replacement factory magazine is your best choice when needing a spare or replacement mag for your Smith and Wesson centerfire semi auto handgun. With Smith and Wesson's commitment to quality, you can be assured that you will get the absolute best you can get when you buy Smith and Wesson products. The S&W Shield .40S&W 7rd extended magazine is made from the highest quality materials to ensure proper function, the stainless steel magazine body allows for smooth feeding and offers corrosion resistance for long term reliability. Polymer anti-friction follower sits on top of a smooth feeding spring to keep you shooting longer without malfunction. The polymer baseplate on the S&W Shield .40S&W 7rd extended mag offers some impact resistance to help protect the magazine and is easily removeable for magazine maintenence.