The Carlson's Choke Tubes 09201 Bismuth Bone Buster offers a purpose-built extended range MobilChoke for 12 gauge Benelli and Beretta Mobil models, crafted in durable 17-4 stainless steel for long-lasting performance in demanding field conditions. This 12 gauge choke ships with a single constriction designed to optimize shot patterns at extended range, featuring a .040 constriction diameter that enhances pellet uniformity and cumulative downrange energy for tighter patterns on medium to longer distances. Built to withstand rigorous shooting sessions, the 17-4 stainless steel construction provides robust corrosion resistance and dimensional stability, ensuring consistent performance across varying temperatures and environments. The Bone Buster designation reflects its targeted use for improved penetration and reliable performance on game birds and upland species, while the MobilChoke configuration maintains compatibility with compatible 12 gauge platforms to deliver repeatable results without requiring modifications. Whether you're dialing in your hunt setup for waterfowl, upland birds, or turkey-era versatility, this Carlson choke tube helps you achieve cleaner patterns, quicker follow-up shots, and a more confident take on birds at intermediate ranges while preserving barrel integrity and resale value.