I've shot 9mm and .223 AR "pistols", both of which had buffer tubes. I have also seen AR pistols without a buffer tube. I agree that you should seek an info source more authoritative than an internet forum, but since pistols with and without tubes are both legal, I don't know why it would be illegal to add a tube to a gun that didn't originally have one?
I saw a pic of a gun with a sling swivel mounted on the head of the forward assist. Google "OA-93", and you'll find a variety of configurations.
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