DARK EARTH Front and Rear Sight for AR-15 M16 Flat Top Rifles Low Profile Flip-Up Sight Set Designed to allow attachment to all Universal Dovetail 1913 and Weaver style Rails. Both are made from a durable reinforced polymer and are an excellent option when seeking a quality set of backup sight. Both are .610" when in the folded position, from the top of the receiver. Not for use on Dovetail Gas Blocks Olive Drab Green