Hevi-Shot 12-Gauge Extended Range Waterfowl Browning Invector Choke Tube Thread Pattern: Browning Invector, Mossberg Accu-Choke, Weatherby Multi-Choke, Winchester Win-Choke Gauge: 12 GA Shot Type: Hevi-Shot, lead, or copper plated lead Material: Stainless Steel Popular Firearm Models: Browning BPS, Winchester 1300 and Mossberg 500