Colt produced ColtA(R) AR-15 optics in the 1970s and enlisted them to craft a new version for us, staying as faithful to the original as possible, including the iconic yellow inspection stickers. The Retro 4x Optic incorporates updated technology with modern lenses and construction under the hood. This results in a scope that mirrors the appearance of the original but delivers optical clarity and performance that far exceed it.The Retro 4x Carry Handle Optic features a simple and intuitive fine duplex reticle, reminiscent of the original, along with an elevation turret equipped with BDC (ballistic drop compensated) clicks that closely align with the characteristics of modern .223/5.56 55gr and 62gr ammunition. True to its name, the Retro 4x comes with an integral carry handle mount, making attachment to most AR-15 carry handles a breeze-no tools required.