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.This magazine extension is compatible with 8 shot benelli 12 gauge m1, m2, sbe, sbeii that use 2.75" shells.Caliber: 12 GaugeCapacity: 8rdFinish: BluedModel: Shotgun Magazine ExtensionMaterial: SteelType: Magazine ExtensionModel Fit: M1, M2, SBEBrand Fit: BenelliCapacity: 8