Spuhr’s SP-4004 Unimount is designed for rifles equipped with MIL-STD-1913 or STANAG 4694 rails with high clip-on night vision attachments. The SP-4004’s overall design has been optimized for durability, ease of use and customization. The rings are diagonally cut for better visibility of the windage and elevation turrets, and the interior contact surfaces feature grooved texturing which can be used with adhesive to better secure the scope in place. This option is perfect for firearms prone to sever vibrations such as bench-rest shooters or for those used in off-road vehicles. In addition, the SP-4004 is equipped with seven sets of interfaces to attach over 40 different accessories, making customization options virtually unlimited. Specifications: For use on rifles equipped with MIL-STD-1913 or STANAG 4694 rails with high clip-on night vision attachmentsRings: 34mm (fits most 34mm scope tubes, except those with extended erector housings)Centerline Height: 1.89” (48mm)Length: 4.76” (121mm)Weight: 9.5 ounces Tilt: 0 MIL / 0 MOA Spuhr Unimount 34mm 0MIL/0MOA 1.89" Picatinny Scope Mount for Rails w/ NV Attachments SP-4004