The noise in congress about banning 'assault rifles' and magazines is just that - noise. The Feinstein crowd knows that such a ban will never even get passed in the senate. But, the threat to attempt such a ban could cause enough reps and senators to compromise and accept universal registration of all firearms, which would ultimately lead to the death of the 2nd amendment.
Once Obama replaces 1 conservative on the Supreme Court, he will do his executive order thing (likely after declaring a 'national emergency'), and banish all firearms. Law enforcement will not come knocking on our doors.