You can't top fold an AR stock, it at a minimum has to house the buffer assembly.
You can if you think outside the box. I built an under folding AR which turned out to be way cooler than I had expected.
It is possible to build a stockless AR and it has been done previously by the likes of ZM Weapons and a couple others. The prob is the bolt carrier must be shortened which negates the possibility of FA operation and requires some serious mods to the recoil system.
I didn't want to live with either of those limitations so I used a modified shortened buffer tube.
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