Iver Johnson Mobil Choke Tube Features The Iver Johnson Choke Tube is machined in an Improved Cylinder constriction a versatile choke setting well suited for close to moderate range shooting with .410 gauge shotshells. Stainless steel construction gives the tube strong resistance to rust and corrosion which matters for a part that sits directly in the path of fired shot and powder residue. The extended design allows the choke to protrude slightly beyond the muzzle making it easier to identify remove and install compared to flush-mounted chokes. This extended profile can also aid in reducing muzzle flip for some shooters. Mobil choke style threads are used on this tube so buyers should confirm their shotgun uses this specific thread pattern before purchasing to ensure proper fit. Choke tubes play a key role in shaping shot pattern density and spread and an Improved Cylinder constriction offers a wider more forgiving pattern than tighter chokes. This makes it a good general-purpose option for hunters and shooters who do not need a tight long-range pattern. The Iver Johnson Choke Tube is available for sale at GrabAGun for .410 gauge shotgun owners seeking a reliable Mobil-pattern choke. Iver Johnson Mobil Choke Tube Specifications Manufacturer: Iver Johnson Gauge: .410 GA Choke: Improved Cylinder Material: Stainless Steel Style: Extended Thread Pattern: Mobil Available At: GrabAGun