Primary Arms Classic Micro Red Dot Rider Mount Lower 1/3 Cowitness 1.65 in Black. When looking down the iron sights the red dot will be placed in the bottom part of the Micro dot's scope tube. The lower 1/3rd cowitness setup allows a less obstructed view of the entire scope tube when using the red dot instead of the iron sights. The light weight design constructed of anodized aluminum is easy to install. The riser Features a lifetime warranty. Specifications for Primary Arms Classic Lower 1/3 Cowitness Micro Dot Riser Mount: Manufacturer: Primary Arms Color: Black Finish: Anodized Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Fabric/Material: Aluminum Co-Witness: Lower 1/3 Red Dot Sights-Footprint: Not Applicable Optic Cut: Aimpoint T2 Height: 1.65 in Condition: New Gun Rail: Picatinny Package Contents: Primary Arms Classic Lower 1/3 Cowitness Micro Dot Riser Mount Primary Arms Classic Micro Red Dot Rider Mount Lower 1/3 Cowitness 1.65 in Black 910054