The Rob Roberts Final Strut Rem Choke for 12-gauge shotguns is expertly crafted to enhance your shooting experience. With a constriction diameter of .660 this choke tube is specifically designed for optimal performance. It works exceptionally well with bismuth shot shells particularly when paired with the RRaptor BIZ choke making it a valuable addition to the RRaptor Series. Constructed from durable 174 PH U.S. Stainless Steel this choke is the result of extensive product development and innovation. It is important to note that the RRaptor choke can only be used in one barrel of an over/under shotgun ensuring precise and consistent performance.