Iver Johnson Mobil Choke Tube Features The Iver Johnson Mobil Choke Tube is machined from stainless steel for long term corrosion resistance and consistent performance across repeated use in the field or at the range. Its modified constriction is a versatile middle ground choke tightening shot patterns enough for mid range targets while still giving a workable spread for closer flushes. The Mobil choke style threads are a widely used pattern so shooters running compatible shotguns can swap this tube in without machining or fitting work. Stainless steel construction also resists the fouling and corrosion that steel shot and modern non toxic loads can cause over a season of use. The extended design projects slightly past the muzzle which makes the choke easy to identify and hand tighten without a wrench in most situations. That extended profile also helps protect the barrel s forcing cone threads from debris during storage and transport. Iver Johnson builds its choke tubes to standard Mobil specifications giving shooters a reliable replacement or upgrade option for shotguns using that thread pattern. This modified 12 gauge choke tube from Iver Johnson is available for sale at GrabAGun for hunters and clay shooters looking to dial in their shot pattern. Iver Johnson Mobil Choke Tube Specifications Manufacturer: Iver Johnson Model: Mobil Choke Tube Caliber: 12 GA Choke Constriction: Modified Profile: Extended Material: Stainless Steel Thread Pattern: Mobil Available At: GrabAGun