Tony,
I was doing a little research to see if anyone else make a "bullet button" for your awesome shotguns and I found a place that does!
EDIT: I just realized it says "bolt on trigger guard". That might not work with your factory guns.
Here's a quote from their website:
solar tactical
I emailed them and they have them available.
When your next order window opens up can I place an order and send you their "bullet button" device to install to make the Tromix legal for California?
I can send you the device for you to check out first to see if you like what you