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Your "research" needs a do over as there is only one manufacturer of AR10s.
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Get over it already. It's a damn nomenclature, it's just a couple of letters and numbers. This isn't Highlander. I love Armalite mags, and that's it. The company itself is stale, I hate cats, and they are so up the butt tight about their name and other companies designing lowers that use their mags. The whole cockiness over the name has really ruined the credibility of the company as a whole.
No one wants to be part of a very small, smug society who thinks their farts smell like strawberries and cream. Before anyone argues, just go through the archives here and see the fake sense of entitlement many, many Armalite rifle owners have.
Modern Armalite is in no way related to Armalite of the 50s besides the name. So, technically there is only one AR10, and it died a long time ago with the original Fairchild/Armalite.
So, heed your own advice and do more research.
ETA: Build your own, many good receivers out there. You'll get exactly what you want and save a little bit as well as opposed to buying complete and swapping parts.