I think my chassis should work with anything as long as it uses a buffer tube. I actually just got a new stock which is similar to the last picture. The clearance is not as nice around the top of the hand, but it does work.doesn't look like I can use an actual AR rifle stock on that one either
I wanted to see one where I can use one of my left over AR stocks, like my Ace ARFX, Yankee Hill Machine Ultra Lite, or a Magpul Moe Rifle..which require a different type of connection to the rest of the chassis, not just a threaded hole or a bit of picatinny rail
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I think the CrazyIvan chassis system does work with buffer tubes, but it definitely is lacking in hand clearance. It's one of the reasons I decided to do my own.