Small arms will not stop fully outfitted “swat” teams with MRAP’s. My home was built this century. Plywood, 2 X 6 walls, brick veneer, lots of windows. You could crash the walls with a VW.
Your typical brick, block or wood home doesn’t provide significant cover from any small arms 9mm and larger.
MRAPs and other vehicles are not invulnerable - and it is cheap to counter them (if one uses one’s gray matter): http://madogre.com/OldMadOgre/Interviews/myths_molotovs.htm