The Rob Roberts Biz Raptor Invector 20 Gauge Choke is a high-performance addition to the RRaptor Series crafted for optimal compatibility with bismuth shot shells. Engineered from robust 17-4 PH stainless steel this choke exemplifies years of innovation and product development. Designed for single-barrel use it enhances the shot's performance making it an essential tool for any shotgun enthusiast seeking precision and reliability.