That is correct. The AFGs aren't considered forward grips because there's no place for the thumb to go. Basically the same logic as featureless pistol grips that you see on California compliant ARs.The only reason there would be a restriction is if you were building an AR pistol with a barrel shorter than sixteen inches. My understanding is that the angled fore grips are ok on pistols but vertical are a no go. Someone correct me if I am wrong on that.