This Beretta replacement or spare magazine is for your APX 9mm pistol. It's available in a 21 round capacity and fits a 9mm caliber. It comes in a black finish. The Beretta APX magazine is an easily removable double stack device that allows for a rapid reloading of the pistol. Beretta makes a commitment to its customers to deliver the highest quality products in the industry. This magazine shows Beretta following through on that commitment.