The Rob Roberts Gun Works 200303 Biz Raptor Invector Plus 20 Gauge 17-4 PH Stainless Steel delivers a precision-choke solution for shooters seeking enhanced patterns and durability in waterfowl and upland applications. Built from 17-4 PH stainless steel, this RRaptor BIZ choke is engineered through years of development to maximize performance with bismuth shot and other high-density options, offering reliable corrosion resistance and long-term consistency in high-volume use. Specifically designed for the Invector Plus platform, this choke tube pairs perfectly with the BBs and payloads commonly used in 20 gauge loads, helping you achieve tighter, more uniform patterns at a variety of practical ranges. The RRaptor line represents Rob Roberts Gun Works commitment to innovative design, ensuring a robust fit, smooth installation, and dependable performance when the moment counts. While over-shotgun configurations limit barrel compatibility to a single barrel, the BIZ chokes optimized geometry works to deliver meaningful improvements in shot string and energy transfer, making it a strong addition for enthusiasts who value precision, repeatability, and rugged stainless construction in a dedicated 20 gauge setup.