Dueck Defense, Inc. Rapid Transition Sights™ are the ultimate backup sight, designed to sharpen firearms performance while seamlessly mounting onto the rail of a standard rifle. The low-profile designs are easily mounted to the upper picatinny rail of an M4/M16 but at an offset of 45 degrees to avoid conflicting with the primary sight. These state-of-the-art sights are optimized for shooting close-up targets or as a backup sight and are available in right-hand or left-hand applications. All products are individually handcrafted with premium quality materials and Made in the USA.