The Carlson's Choke Tubes 09224 Bismuth Bone Buster Winchester 20 Gauge Mid-Range 17-4 Stainless Steel delivers a precision mid-range constriction of .025 inches in a durable 17-4 stainless steel body designed for Browning Invector, Winchester and Mossberg 500 platforms, providing a reliable upgrade for improved pattern consistency and versatility across waterfowl, upland, and sporting clay scenarios. Crafted from high-grade stainless steel, this single choke combines rugged construction with a tight, controlled mid-range pattern that helps you maximize your 20 gauge setup without sacrificing reliability or ease of use. The Invector-compatible design ensures straightforward installation and secure fitment, so shooters can confidently switch chokes to tailor pellet spread for varying ranges and target sizes. While designed for non-firearm-specific uses, the choke tube integrates seamlessly into established shotgun configurations, enabling predictable performance with standard lead or non-toxic shot as conditions demand. This Carlson offering emphasizes durability and repeatable results, making it an ideal choice for hunters seeking a dependable, long-lasting choke that enhances long-to-mid-range effectiveness while maintaining smooth operation during rapid target acquisition.