Carlson's shotgun magazine extensions add firepower to your favorite shotgun.These magazine extensions are constructed of blued solid steel and come with spring, base clamp and a high visibility follower.The threaded tube replaces you magazine cap and gives you the ability to add extra rounds to you magazine.Fits benelli nova/super nova, cz 712/912, and beretta extrema.Caliber: 12 GaugeCapacity: 7rdFinish: BluedModel: Shotgun Magazine ExtensionMaterial: SteelType: Magazine ExtensionModel Fit: Benelli NovaBrand Fit: BenelliCapacity: 7