The Colt Retro 4X carry handle mounted scope — a modern reproduction of the original Colt Sporter optic first seen on A1 and A2 Colt rifles in the 1970s, with updated lenses and construction.
The original Colt Sporter scope was manufactured under contract by Hakko Optics in Japan and sold as a Colt-branded accessory from the 1970s onward. It was one of the earliest magnified optics purpose-built for the AR-15 platform, designed to mount directly into the carry handle without tools or adapters. Sharpshooters, US Air Force security personnel, and MACV-SOG operators were among the early adopters during the Vietnam era, though most servicemembers relied on iron sights. The scope carried over onto M16A1 and M16A2 rifles through the 1980s and into the first Gulf War, before the Aimpoint M68 CCO and later the Trijicon ACOG began displacing magnified carry-handle optics in frontline service.
This reproduction retains the external profile and mounting system of the original but upgrades the internals. The multicoated lenses address the fogging and clarity issues that plagued the 1970s Hakko glass, and the construction is sealed to modern waterproof standards. The BDC turret is calibrated to match the ballistic arc of standard 55gr and 62gr .223/5.56 loads from a 20" barrel — close enough to remain useful across common bullet weights at ranges out to 400 yards, where the trajectory differences are measured in fractions of an MOA.
For retro builders assembling an M16A1, XM177, or early AR-15 Sporter, this is the optic that completes the period look while delivering optical performance the originals could not match. Colt part number RETRO4X-COLT. Distributed by Brownells.
We stock these for the retro crowd — they sell through fast. Add to cart and build it right.
Potomac Armory
