Iver Johnson Rifled Choke Tube Features The Iver Johnson Rifled Choke Tube is machined from steel and built around a rifled bore designed to impart spin on sabot slugs improving accuracy at extended ranges compared to a smooth bore choke. It uses the Mobil choke style thread pattern allowing it to thread directly into compatible 12 gauge shotgun barrels without modification. The rifled design is intended specifically for slug hunting applications where tighter groups matter more than shot pattern spread. Steel construction gives the tube the strength needed to handle repeated use in the field. Its extended profile protrudes slightly beyond the muzzle making the tube easy to grip and install or remove by hand during a hunt or at the range. This extended design also makes it simple to identify at a glance which choke is currently installed. Because it uses the widely adopted Mobil thread pattern it fits a range of shotguns built around that choke system. The Iver Johnson Rifled Choke Tube is a practical upgrade for hunters chasing better slug performance. Iver Johnson Rifled Choke Tube Specifications Manufacturer: Iver Johnson Model: Rifled Choke Tube Gauge: 12 GA Choke: Rifled Profile: Extended Material: Steel Thread Pattern: Mobil Available At: GrabAGun