Bismuth is a preferred material in the shot shell industry for its exceptional performance, and it delivers its best results when paired with the Raptor BIZ choke. As a powerful addition to the Raptor series, this choke tube is the result of years of rigorous product development and cutting-edge innovations. Crafted from 17-4 PH US stainless steel, it is engineered for long-lasting durability and reliability. Precision-machined with advanced equipment to tolerances that exceed industry standards, the Raptor BIZ choke ensures consistent, high-performance results every time you use it. Over-Shotguns can have a Raptor choke in only 1-barrel, the design of the choke does not allow for placement in both barrels, ensuring optimized performance in one barrel