The Carlson's Choke Tubes Bone Collector Turkey Invector is engineered to deliver extremely tight patterns for turkey hunting with Winchester 12 gauge shotguns, featuring a ported, extended design in 17-4 stainless steel with a non-reflective matte black finish. Carlson's Ported Bone Collector Turkey Choke Tubes are precision-machined to provide a longer taper section before the constriction, ensuring tighter patterns with reduced flyers across a wide range of shotshells, including lead, nickel-plated, copperplated, bismuth, hevi-shot, tungsten, and TSS. Each choke tube is pattern tested to perform best with 4 through 10 shot, helping hunters place more pellets on target with every shot while maintaining robust durability and corrosion resistance. The .660 constriction and Invector configuration are tailored for 12 gauge turkey loads, delivering an ideal balance of density and pattern density at typical turkey ranges. For shots using larger than #4 shot, a more open choke tube is recommended to optimize patterning, and the user is encouraged to pattern with the specific shell being employed to account for ammunition variance. This Bone Collector choke tube combines precision machining, practical field performance, and a matte finish designed for rugged field use.