The bullet button will not help since the new law went into effect, you will still have to register it. Unless you make it featureless before you bring it in, it will need to be registered as a assault weapon which means you can never sell it unless you go out of state. I personally would go featureless. Fixed stock, blade or ugly grip, replace flash hider with brake. Having said that, there is already talk that the grabbers are going after featureless rifles in the next round. This is a major reason for me telling the state to kiss my ass on my way out...
As mentioned, nothing you can do about the mags other than sell them before you enter. They used to be grandfathered but now anything above 10 rounds is illegal to have, period.
Good Luck!