Since the point IS to use your pistol to fight to get to your rifle, then why make it any worse than necessary? Speed of deployment being paramount, what is better, a gun that can work straight out of storage, or one that requires some time spent getting it into action?
The folding stock AR15 pistol can be carried loaded inside a vehicle, a rifle, even broken down, is often required to be in a locked case with ammo stored separately. I didn't make that distinction in my comparison. When you are ducking for cover and attempting to retrieve it, which is better?
Hiking on a trail, you encounter a cub and discover you are between it and it's mother, or you glimpse a cougar stalking you up the hillside. Which is better, a loaded AR15 carried on a sling, or your takedown rifle neatly stored in your pack?
What is it about assessing the risk and accepting you need a rifle, but then trying to cover up you have it? In the great outdoors it's no big deal. What I'm reading is an attempt to hide it for social reasons, not tactical.
Like I said, these have been on the market before and there doesn't seem to be enough business to sustain it. It's a small niche of users who apparently aren't repeat buyers and certainly haven't convinced many to jump on the bandwagon. Take downs aren't uncommon, but even the firearms makers tend to limit them to just a few offerings for a short duration. Kind of like short bed pickups, everybody thinks they are cute, but don't really rely on them to do any major work. That's why we don't see standard sniper rifles issued to the various armies in takedown mode. They apparently can't benefit from it.
Here's an alternative - clamp a round tube free float to the barrel nut and keep it short enough to get to the gas block. Cut away enough of the barrel nut teeth to clear the tube when hand tightened. Use thumbscrews to clamp the block to the barrel.
Install barrel, tighten hand guard, slip gas block down, tighten thumbscrew, shoot. A take down that doesn't cost an arm and a leg. The barrel nut torque isn't 60 foot pounds, it's a minimum of 25, that's hand tight. The nut tooth is to keep it from loosening up under combat stress over months of action - that's not a high country hike. The gas block seats against the shoulder on the barrel and the set screw fits into a drilled dimple. Five minutes with a grinder and the properly threaded screw and I could fix up my Apex Gator Grip 6.8. It would take longer to shop for the thumb screw than do the work. I'm not going to bother, post up how it worked for you and tell us you saved $160.
Oh, wait, sorry, it doesn't have a Brand and therefore isn't Cool. And yet it does the same thing. If it sounds too hillbilly then maybe the point isn't about being a takedown, it's about buying something to reflect on someones social status, I Have One and You Don't. That is the #1 selling point of most aftermarket AR15 products anyway.
Vets and the Army both know that the standard GI rifle is plenty good enough, it's the people who don't rely on it for literal life and death who tend to "improve" it.