Features: Durable and reliable - The XPR's detachable box magazine is constructed of a light yet rugged polymer and securely latches at both the front and rear for added security and to endure feeding reliability Form and function - just a pull with a forward finger and the magazine is in your hand for loading or unloading Extra convenience - having an extra XPR magazine in your pocket - ready to be used - is one of the great convenience features that comes with the XPR design versus a fixed (or hinged) floorplate design