Not familiar with the cookie cutter front mount design, but if a barrel is shorter than any handguard, the escaping gasses that exit the barrel's end will be redirected quickly to somewhere around your finger tips and get warm very quickly.
Now if the cookie cutter end is designed in a way to allow for suppressor usage, then the suppressor being used would extend out past the handguard end and be fine as it will redirect the bullet's gas direction.
I would not want a barrel and a mounted flash hider or compensator with any gas diverter holes that is shorter or at the handguard's front ending. Fired bullet gases and powder flames are very hot in micro seconds and if you have your hands where the flames would shoot out the handguard, you couldn't move fast enough to not get burnt.