When you want extremely quick target acquisition and engagement, then you need a red dot sight. If you want to co-witness that red dot with your front sight, then you need the SIG Sauer SigTac Mini Red Dot Sight Riser. This riser is available for those using the SIGTac Mini Red Dot Sight on an AR style rifle platform with a flat top rail. The Mini Red Dot Sight Riser enables the user to bottom 1/3 co-witness with their A2 height fixed or folding iron sights. Clamp the riser to the accessory rail on your rifle using the supplied hardware and mount your sight to the riser.