Athlon Optics Gen II 56mm Riflescope Sunshade Black. 5 x 2.5 in Objective Lens Diameter: 56 mm Tube Diameter: 56 mm Gun Type: Rifle Length: 4 in Weight: 1 lb Condition: New Features of Athlon Optics Gen II 56mm Riflescope Sunshade Black matte surface finish 4.5 inches long sizes in 56 50 44mm. Package Contents: Athlon Optics Gen II 56mm Riflescope Sunshade Athlon Optics 212100S: Gen II 56mm Riflescope Sunshade Black