If the GA barrel nut is designed with the material properties of AL in mind, then it's very likely fine. It would permit the handguard to function as a heat sink in a very effective manner.
I have used V7 Weapons Grade V Ti barrel nuts for my BCM KMR handguards for almost a decade now. Very pleased with them;l I employed them for weight savings, but they are BCM-approved and fit/function exactly like the BCM nuts with the sole exception that I have never had a V7 Ti barrel nut round-over using the wrench during tightening.
I think Bill Geissele very likely diid his homework on the AL barrel nut. I wouldn't sweat it one bit.
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