Iver Johnson Extended Choke Tube Features The Iver Johnson Extended Extra Full Choke Tube is machined in 20 gauge and cut to an extra full constriction tightening shot patterns for the longest effective range a shotgun can deliver. That extra full constriction is especially useful for turkey hunters who need dense patterns at extended yardage or waterfowl hunters reaching out for high birds. Threaded to the Mobil choke pattern the tube is built to drop directly into compatible 20 gauge shotguns without modification. Steel construction keeps the tube durable through repeated use and exposure to the elements. The extended profile extends slightly past the muzzle making the tube easy to identify and hand tighten or remove without a wrench in the field. That visibility also helps hunters confirm at a glance which choke is installed before heading out. Pairing the correct choke to a hunting situation is one of the simplest ways to improve pattern performance without buying a new barrel. Hunters running a 20 gauge Mobil pattern shotgun can use this tube to dial in tighter more consistent patterns for turkey and waterfowl seasons. Iver Johnson Extended Choke Tube Specifications Manufacturer: Iver Johnson Model: Extended Choke Tube Gauge: 20 GA Choke Constriction: Extra Full Material: Steel Thread Pattern: Mobil Available At: GrabAGun