The Carlson's Choke Tubes 18899 Buckshot 18899 12 Gauge Ported 17-4 Stainless Steel delivers reliable performance for demanding shotgun setups, combining Carlson's legacy of precision with an extended Invector-Plus design crafted from 17-4 stainless steel and finished in black for durability and corrosion resistance. This ported extended choke features a constriction diameter of .710 and is built to accommodate steel, lead, and non-toxic shot types, offering flexible options for buckshot applications and improved muzzle control. With a single choke included, the 12 gauge configuration aligns with Browning Invector-Plus receivers, enhancing fit and consistency across field, range, and hunting scenarios where accurate shot placement and reliable choke performance matter. The smooth, extended profile promotes efficient gas sealing and cleaner patterning, while the porting helps manage recoil for steadier follow-up shots. Designed for rugged field use, this choke is constructed from high-grade 17-4 stainless steel and finished in a stealthy black coating, ensuring long-lasting performance under harsh conditions. Whether refining long-range buckshot patterns or optimizing close-range self-defense loads, Carlson's 18899 delivers trusted, repeatable results.