Yeah, but it *is* legal to get your Class III in some states, and an RDIAS (RDIAS = legal drop in, as it is registered) is the cheapest way to get into Class III weapons. I just mentioned it as it is something to think about for those who may want to preserve their options and be able to use their existing investments in ARs when jumping to the Class III world.
For most people, it does not matter at all and they will never go there, so they’re good to go no matter if the receiver is high or low shelf internally.
The Stag I just got has to have a “fixed” 10 round (max) magazine. Use a Bullet Button, aka “tool” to remove it.
They kept changing the Assault Weapons Law to ban anything that they don't like. What a Pistol Grip or a Bayonet Lug has to do with anything is beyond me.
Now the 50 Cals are illegal, even though there has never been a crime committed with one. The idiocy knows no bounds.