Weaver Top Mount Base for Marlin 36/336 Mossberg 640 (63BS Silver) Edge 540/840 Its arc-shaped design matches the

Its arc-shaped design matches the natural curvature of the human eye

Highly directional

9) 3 Stop is specially designed to reduce the amount of light entering the camera by 3 stops

Ultraviolet (UV) filter absorbs the UV rays from the sun and gives a sharper contrast and vivid picture and serves as a permanent lens protector against scratches

Weaver Top Mount Base for Marlin 36/336 Mossberg 640 (63BS Silver) Edge 540/840 Its arc-shaped design matches theEach Weaver base is machined to tight tolerances for a custom fit. This aluminum base offers maximum strength for rings to hold tight. It offers the rock solid Weaver cross lock design to fit a variety of rings.