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There's one specific to the AR-10 but they're nearly impossible to find. Its (well, was) made by Armalite for their National Match guns I think. I ended up finding one on GunBroker after spending a few weeks looking and asking Wolverine if they could order one in. No dice.
There is one for the AR10. They’re longer and really expensive. I saw one pop up on the EE not long ago for $180. It was just posted for a few minutes and it sold by the time I messaged the seller. I would like one for my AR102 build.
I'd think an AR15 handle would "work" for sights and carry. It's mostly about the look of the handle shorter than the receiver. If your build have a handguard with top rail it may look ok. With a traditional round handguard it would look weird.