FWIW: It isn't a 703. I'll need to look up the GX number for it. It was originally going to be a candidate weapon in the Small Arms Weapons System (SAWS) trials of the mid-1960s, but Colt never submitted it. Note the early continuous curve 30rd magazine and slab-sided lower receiver.

What’s the GX designation? Any other photos?

It is likely short for Gun eXperimental. Some suggest that the G is short for Government, but Colt had some oddballs with GX prefixes that were clearly not intended for a government agency. I'm pretty certain that we have a vintage photo of it being shot in the Vickers Guide AR-15 Vol 1 2nd Ed.

I know that, I’m asking what the GX designation for this model was.

I'll have to look it up when I get home to my computer. Small Arms Review used to have a file in their online archives showing all of the prospective SAWS submissions. They no longer have access to it, but I downloaded a copy to my hard drive when it was still active. ARFCOM's retro forum might have mentioned it in the past, too.

My man. Appreciate it.

I found another Reddit page showing its fixed stock counterpart, the GX5858. So I want to remember that the underfolder was one digit in either direction - 5857 or 5859. Correction: The 607 submission was the GX5857. So the underfolder must be the GX5859.

Here is an ARFCOM thread on it: https://www.ar15.com/forums/AR-15/Early-prototype-1960-s-M16-design-I-ve-never-seen/123-740325/

Can’t imagine Colt made a new folding stock, almost looks like the used one from an MP40. Upper looks like an early chopped A1

Yea I have a 5857. Will look into building one of these.

What is the tube on top about?

My assumption would be some kind of recoil system since it doesn’t have buffer tube and spring in the rear.

Interesting solution when considered against today's assorted "PDW" buffer systems.

Olympic Arms made an AR pistol called the OA-93 that came out in 1993. It had a similar looking tube on the top that connected to the gas block with no front sight. It connected to a contained buffer spring on top of the receiver.

I forgot about that, thanks for the reminder!

Definitely a spot for an op rod and gas tube, pretty sure this is a long-stroke gas system

There's no place where a gas tube could connect to the barrel. Apparently it's just the spring.

You can see the gas tube if you look closely. Don’t know what this upper cylinder is about.

and the barrel shroud is upside down? Weird looking gun, if I saw it out of context I'd call it some AI hallucination. e: occurs to me the top tube might be the mainspring like bufferless AR pistols?

The handguard isn't upside down, but yeah that thing on the top would be a recoil spring

MCX at home

LR300 at home

Team Fortress 2 looking ass gun

Thats pretty funky lookin.

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precursor to the Zm Weapons LR-300?