Spuhrs SP-4616 34mm Cantilever Mount was built for use on long-range AR10 platforms equipped with MIL-STD-1913/STANAG 4694 rails, and features an absolute so-witness with back-up iron sights. The SP-4616s 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-4616 is equipped with eight sets of interfaces to attach over 40 different accessories, making customization options virtually unlimited. Specifications: Designed for use on long-range AR10 platforms equipped with MIL-STD-1913/STANAG 4694 rails, and features an absolute so-witness with back-up iron sightsRings: 34mm (fits most 34mm scope tubes, except those with extended erector housings)Centerline Height: 1.5 inches (38mm)Length: 5.9 (150mm)Weight: 8.9 ouncesAvailable Spuhr 34mm Cantilever Mount MPN Height Inclination QDP SP-4026 1.26" 0 MIL/MOA QDP-4046 1.35" 0 MIL/MOA Yes SP-4016 1.5" 0 MIL/MOA QDP-4016 1.5" 0 MIL/MOA Yes SP-4616 1.5" 6 MIL/20.6 MOA QDP-4616 1.5" 6 MIL/20.6 MOA Yes SP-4024 1.89" 0 MIL/ MOA Spuhr Cantilever Unimount 34mm 6MIL/20.6MOA 1.46" Picatinny Scope Mount SP-4616