I have a free floated handguard on my one AR and it doesnt have a heat shield. Its also wide open at the front and vented at the rear, so the heat isnt trapped. Those type rifles are not generally shot in full auto or that fast to really be an issue either.
My Saiga AK103K has a heat shield in its handguard, and the other "issue" handguards I've seen have had them. Its the crappy US stuff I've seen that doesnt.
I have never seen an AR (other than the free float tubes) that didnt have a heat shield in the hand guards.
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