The Rob Roberts Gun Works 200283 Biz Raptor Invector 12 Gauge 17-4 PH Stainless Steel delivers a high-performance, purpose-built choke system designed to optimize bismuth shot performance its RRaptor BIZ choke pairs with, extracting tight patterns and consistent hits. Constructed from 17-4 PH stainless steel, these choke tubes reflect years of development and advanced technology, combining durability with precision to handle demanding field conditions. In a 12 gauge setup, the Biz Raptor Invector design enhances patterning when used with bismuth shot, offering a strong addition to the RRaptor series that shooters rely on for dependable performance. The over- or under-barrel compatibility note is practical: Over-Shotguns can have a RRaptor choke in only one barrel, as the design does not allow placement in both barrels, ensuring shooters understand how to maximize their shotguns performance without compromise. This product embodies Rob Roberts Gun Works commitment to quality materials and innovative choke concepts, delivering an ideal balance of rugged stainless construction and refined threading that supports consistent, game-ready patterns. Whether pursuing upland birds or waterfowl, this 12 gauge choke tube stands ready to enhance your field results with precision and reliability.