Jebs Choke Tubes Upland and Windshooting 12 Gauge Choke Tube Remington .690 Improved/Modified Upland Tube Matte Stainless JPC - 12A2/690. 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. Choke Tube Comparisons for JEBS Restrictions Versus Standard Factory Choke Sizes: .675 - Similar To A FACTORY FULL. .680 - Similar To A FACTORY FULL/MODIFIED. .685 - Similar To A MODIFIED. .690 - Similar To A MODIFIED/IMPROVED. .695 - Similar TO A IMPROVED. Specifications for Jebs Choke Tubes Upland and Windshooting 12 Gauge Choke Tube: Manufacturer: Jebs Choke Tubes Finish: Matte Fabric/Material: 17-4 Heat Treated Stainless Steel Gauge: 12 Choke Tube System: Remington Choke Gun Make: Remington Quantity: 1 Features of Jebs Choke Tubes Upland and Windshooting Choke - 12 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 Choke - 12 Gauge Jebs Choke Tubes JPC - 12A2/690: 12 Gauge Remington .690 Improved/Modified Upland Tube Matte Stainless