U.S. Optics 2 Hole MGM Switch View Lever Matte Black Small. S. Optics 2-Hole Switch View Lever is specifically designed to fit Legacy B-Series and Foundation Series scopes. Attaching the lever to the power collar allows the shooter to quickly adjust their optics magnification by gently rotating the lever. Length of lever: 0.648 in. Specifications for U.S. Optics 2 Hole MGM Switch View Levers: Manufacturer: U.S. Optics Color: Black Weight: 1 kg Length: 0.648 in Finish: Matte Gun Type: Universal Size: One Size Gun Make: Universal Gun Model: Universal Width: 2 in Height: 2 in Package Contents: U.S. Optics 2 Hole MGM Switch View Levers What firearm models does the manufacturer say U.S. Optics 2 Hole MGM Switch View Levers is compatible with? The manufacturer says that U.S. Optics 2 Hole MGM Switch View Levers is compatible with UniversalU.S. Optics SVL-102: 2 Hole MGM Switch View Lever Matte Black Small