Just released at Brownells…Colt retro 4x carry handle optic.

“We actually tracked down the original company that manufactured the Colt® AR-15 optics of the 1970s and asked them to build a new one for us as close to the original as possible – right down the yellow inspection stickers. The Retro 4x Optic has updated technology under the hood, with modern lenses and construction. The result is a scope that looks just like the original but has optical clarity and performance that are head and shoulders above it.

Attaches to any standard AR-15/M16 carry handle

Fully Multicoated lenses are fog and waterproof

BDC click-adjustable elevation turret

Manufactured in Japan with high quality internals and lenses

The Retro 4x carry handle optic sports a simple, intuitive fine duplex reticle, like the original, and an elevation turret with BDC (ballistic drop compensated) clicks that closely match modern .223/5.56 55gr and 62gr ammo. As its name indicates, the Retro 4x comes with an integral carry handle mount that easily attaches to most AR-15 carry handles.”

https://www.brownells.com/optics/scopes/rifle-scopes/ar-15m16-4x-retro-carry-handle-scope/