There are many good options.
I personally have and like the Centuruon M-LOK handguards and the KAC URX4.
But BCM, Geissele, ALG (had one), CMT (have one unassembled), Aero Precision Atlas, LaRue... All are going to be fine. Part of the question is how much you want to spend and what (if any) unique features you want. Just don’t get trash.
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