Probably an EO banning hi capacity mags, and he will try to stop importation of foreign made ammo, firearms, and their components.
He will say congress needs to get together and reinstitute the AWB of 1994 with stricter background checks and inter agency cooperation.
He might even go after some form of control over internet selling of ammo and other components.
He will say it is every americans responsibility to make sure we are protection our children and their future.
In the end we will probably see a ban on hi cap mags, stricter background checks, some type of control over internet sales, and possible tax on ammo.