Product Info for Primary Arms Classic Lower 1/3 Cowitness High Cantilever 30mm Mount The High Cantilever Mount will raise most 30MM tube red dot sights (Aimpoint, Vortex, Primary Arms, etc.) to allow for a lower 1/3rd cowitness. A lower 1/3rd co-witness places the red dot in the bottom part of the scope tube when aiming down the iron sights. This allows a less obstructed view of the entire scope tube when using the red dot instead of the iron sights. (Sight in photo not included). If utilizing a red dot magnifier, pair up with standard height flip to side mount such as PAMQF-01 or PAQDMQF-01. This tough mount features a lifetime warranty. WARNING: California`s Proposition 65 Specifications for Primary Arms Classic Lower 1/3 Cowitness High Cantilever 30mm Mount: Manufacturer: Primary Arms Color: Black Finish: Anodized Matte Gun Model: AR-15 Gun Type: Rifle Co-Witness: Lower 1/3 Height: 1.65 in Weight: 5 oz Fabric/Material: Aluminum Condition: New Optic Cut: Aimpoint T2 Gun Make: AR Platform Tube Diameter: 30 mm Package Contents: Primary Arms Classic Lower 1/3 Cowitness High Cantilever 30mm Mount