Iver Johnson Choke Tube Features The Iver Johnson Improved Cylinder choke tube is machined from stainless steel giving it resistance to the corrosion and fouling that can build up inside a barrel during repeated use. Built specifically for the Mobil choke thread pattern it threads directly into compatible 28 gauge shotguns without needing an adapter or aftermarket fitting. The extended profile makes the tube easy to grip and spin out with a choke wrench simplifying cleaning and swapping between constrictions in the field. Its Improved Cylinder constriction spreads shot wider at typical close range distances which is a common choice for fast moving targets. Because the tube is purpose built for 28 gauge shooters get a precise fit rather than relying on a universal tube that may not pattern as consistently. The extended design also helps protect the shotgun s muzzle crown from wear compared to a flush mounted tube that sits level with the barrel. Stainless steel construction means the tube holds up well across repeated seasons of hunting or clay target shooting without significant degradation. The Iver Johnson 28 GA Improved Cylinder choke tube is available for sale at GrabAGun for shooters who need a dependable Mobil pattern option. Iver Johnson Choke Tube Specifications Manufacturer: Iver Johnson Caliber/Gauge: 28 GA Choke: Improved Cylinder Thread Pattern: Mobil Style: Extended Material: Stainless Steel Available At: GrabAGun