None.
But if Hillary were in office and the republicans held the house and senate, do we really think there'd be any equivocating with age limits, bump stocks, etc. that various republicans are getting wishy-washy on now? Sandy Hook was probably as bad as Parkland but with Obama in office, the republicans at least had an ideological reason to not go wobbly. With Trump's unfortunate undisciplined populism, the weak-kneed repubs have cover to give this round of gun control legs.
that's a good point, a congress deadlocked with a president and not 'accomplishing' anything on guns is a win. If congress acts on guns is only to restrict them.