I do not believe the original post is correct in the use of the bullet button. You CAN use a tool (like tip of a bullet) to press the mag release and reload the magazine. You do not have to insert rounds individually into an open breach.
Yea, I know the bullet button thing is a pain and seems senseless (to me as well), but that is the law in CA. At least, one way to get around a long arm with pistol grip, and flash hider. Buy the way you will need to get a lower that is not on the band list.
I sure am enjoying my DPMS LR308 with 20 round mags here in FL.