Getting ready to install my new Rainer Arms barrel. The fitment is extremely tight. Have experienced this before and using heat plus freezing barrel always works. The problem this time is I’m installing s JP Mk 3 hand guard and the barrel nut needs to go on before the barrel is inserted. This puts the barrel extension receiver recessed in the JP barrel nut. Do you think using a heat gun instead of the normal MAPP gas will work and not destroy the barrel nut.