The Carlson's Choke Tubes 80120 Bone Collector Remington Rem Choke 12 Gauge Turkey Extended/Ported 17-4 Stainless Steel delivers precision-tuned performance for serious turkey hunters, featuring a ported, extended design with a tight .660 constriction that has been pattern tested to produce extremely dense patterns with a broad range of shotshells, including lead, nickel-plated, copperplated, bismuth, hevi-shot, tungsten, and TSS. Crafted from 17-4 stainless steel with a non-reflective matte black finish, this Bone Collector choke uses a longer taper section to reduce flyers and ensure more pellets on target with every shot, while the Rem Choke-compatible construction makes installation straightforward on compatible 12 gauge platforms. Each choke tube is designed to deliver optimal patterns with sizes ranging from 4 through 10 shot, and Carlson recommends selecting a more open choke if you intend to use shot sizes larger than #4 for optimum patterning. Always pattern your shotgun with the specific load you plan to use to account for differences between ammunition types, ensuring the best possible spread for turkey hunting.