Barska Double Shotgun Barrel Mount Tri-Rail 5 Sections Black. These Gun Accessories from Barska have rail sections on 3 sides for more mounting options. Barska Double Shotgun Tri-Rail Durable Barrel Mounts install easily with no gunsmithing. Barska Double Shotgun Tri-Rail Aluminum Barrel Mounts are Picatinny and Weaver compatible and fit many models of shotguns. Specifications for Barska Double Shotgun Picatinny/Weaver Tri-Rail Barrel Mount Aluminum: Rail Length: 2.4 inches Barrel Range Diameter: 0.75 to 1.1 inches Material: Aluminum Finish: Black Matte Rail compatibility: Picatinny Weaver Features of Barska Double Shotgun Tri-Rail Barrel Mount 5 Sections: Rail Type Picatinny Style Weaver Style Rail Length 2.4in Body Material Aluminum Finish Black Matte Barrel Range Diameter .75in - 1.1in Package Contents: Barska Double Shotgun Tri-Rail Versatile Barrel Mount 5 Sections AW12012 Barska AW12012: Double Shotgun Barrel Mount Tri-Rail 5 Sections Black