Upgrade the sights on your ICS ProLine series rifle with this CFS rear folding sight. This futuristic sight is constructed fully from metal alloy for a reliable, yet lightweight platform. ICS makes sure you have all the necessary parts and tools required for a fast and easy installation. Dual rotating knobs on either side of the sight allows it to be completely adjustable for the perfect shot every time. This sight fits snug on 20mm picatinny rails and can be flipped down out of the way when using an additional optic accessory.