The Iver Johnson choke tube for .410 bore is crafted in durable stainless steel and designed to extend your shotguns capabilities with an Improved Modified choke, delivering a versatile blend of tighter patterns and reliable performance for upland and small game scenarios. This extended choke tube features a Mobil thread pattern for secure, simple installation and consistent shot string, while the stainless construction resists corrosion and holds up under field use. With precise dimensions of 0.70 x 0.70 x 2.00, it integrates smoothly into compatible barrels to optimize choke performance without altering your firearms balance. Use this extension to achieve a controlled, mid-range density that helps you hit birds, rabbits, or small predators more consistently, while maintaining the smooth operation you expect from Iver Johnson shotguns. The combination of stainless steel and expert machining ensures durability under demanding conditions, making this choke tube a dependable upgrade for dedicated shooters who value reliability, pattern control, and ease of maintenance.