Jebs Choke Tubes Upland and Windshooting 20 Gauge Choke Tube Remington .580 Modified Upland Tube Matte Stainless JPC - 20A2/580. JEBS has modified the Upland Choke with proprietary restrictions making it suitable for every upland species: from a covey explosion of quail fast-flying doves or long-range shots at grouse. To put it simply this is the premiere choke tube for all upland hunters. Specifications for Jebs Choke Tubes Upland and Windshooting 20 Gauge Choke Tube: Manufacturer: Jebs Choke Tubes Finish: Matte Fabric/Material: 17-4 Heat Treated Stainless Steel Gauge: 20 Choke Tube System: Remington Choke Gun Make: Remington Quantity: 1 Features of Jebs Choke Tubes Upland and Windshooting Choke - 20 Gauge All tubes are made from 17-4 Stainless and heat treated to 44 Rockwell hardness to accommodate any type of shot SteelTungstunHevi-ShotLead or anything the shooter wants to shoot Package Contents: Jebs Choke Tubes Upland and Windshooting 20 Gauge Choke Tube Jebs Choke Tubes JPC - 20A2/580: 20 Gauge Remington .580 Modified Upland Tube Matte Stainless