OP are you saying that you can't find any notches to get a tool into the bullet button device for removal? Or is it that the usual tools are grabbing, but don't seem to be able to move it?
Totally unfamiliar with bullet buttons, myself, but is it possible to work the portion of the mag catch that actually protrudes into the magwell out far enough to unscrew that, and then free the rest of the Cali-weirdo stuff from the other side?
I assume if they were that easily removable, that California would have a stink fit over owners being able to return it to "normal" operation. I am also aware enough of the ignorance of politicians and bureaucrats to believe this may have been overlooked and still be possible.
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It might have loctite on it. Have you tried heating it up with a torch?
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That or rockset - which is extremely heat resistant and has it's uses on some parts of firearms. Sadly, those parts are far forward of the receiver, but this inspires some back yard armorers (which may potentially apply to an out of business dealer from Cali?) to feel the need to slather it everywhere on a firearm. I pray for you, that this isn't the case.