CRYO GUN - LIQUID NITROGEN CRYO SYSTEM in Varanasi.. CRYO GUN - LIQUID NITROGEN CRYO SYSTEM in Allahabad. Liquid Nitrogen cryo treatment only requires about 1/3 the time required by carbon dioxide or snow or nitrous oxide system (regular cryogun) to achieve the appropriate degree of freezing because of the relative temperatures minus (-196 C compared with -79 C).. Liquid Nitrogen can be applied directly by spraying the gun.....