Explore the innovation of Carlson's Bismuth bone buster Choke Tubes, expertly crafted to produce remarkable, tightly concentrated patterns when used with any Bismuth ammunition. These tubes undergo meticulous CNC machining from 17-4 heat treated stainless steel, boasting an elongated parallel section within the Choke that surpasses the capabilities of standard factory alternatives. This superior design coupled with exhaustive testing using a wide range of loads, results in the ultimate Choke for delivering devastating patterns with Bismuth ammunition. The product line includes a versatile mid range variant with a .025 constriction and an extended range edition with a .040 constriction, catering to various shooting scenarios. These Bismuth chokes seamlessly accommodate lead and Hevi-Shot loads, with the mid range model suitable for all steel shot types and the extended range model accepting steel shot up to #2 size. Enhance your shooting experience with the extraordinary pattern density provided by these pioneering Bismuth Choke Tubes, all supported by Carlson's dependable lifetime Warranty.