Carlson's Choke Tubes Tru-Choke 12ga Black SC Modified .710 Black 37054. 710: Manufacturer: Carlson's Choke Tubes Color: Black Fabric/Material: 17-4 Heat Treated Stainless Steel Gauge: 12 Choke Tube System: Tru-Choke Choke Type: Modified Diameter: 0.71...