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Welcome to OCDO, HAPPY! Yes, you can open carry (unloaded) at 18. Here are the applicable laws.
76-10-502. When weapon deemed loaded.
(1) For the purpose of this chapter, any pistol, revolver, shotgun, rifle, or other weapon described in this part shall be deemed to be loaded when there is an unexpended cartridge, shell, or projectile in the firing position.
(2) Pistols and revolvers shall also be deemed to be loaded when an unexpended cartridge, shell, or projectile is in a position whereby the manual operation of any mechanism once would cause the unexpended cartridge, shell, or projectile to be fired.
(3) A muzzle loading firearm shall be deemed to be loaded when it is capped or primed and has a powder charge and ball or shot in the barrel or cylinders.
76-10-505. Carrying loaded firearm in vehicle or on street.
(1) Unless otherwise authorized by law, a person may not carry a loaded firearm:
(a) in or on a vehicle;
(b) on any public street; or
(c) in a posted prohibited area.
(2) A violation of this section is a class B misdemeanor.
76-10-509. Possession of dangerous weapon by minor.
(1) A minor under 18 years of age may not possess a dangerous weapon unless he:
(a) has the permission of his parent or guardian to have the weapon; or
(b) is accompanied by a parent or guardian while he has the weapon in his possession.
(2) Any minor under 14 years of age in possession of a dangerous weapon shall be accompanied by a responsible adult.
(3) Any person who violates this section is guilty of:
(a) a class B misdemeanor upon the first offense; and
(b) a class A misdemeanor for each subsequent offense.
76-10-509.4. Prohibition of possession of certain weapons by minors.
(1) A minor under 18 years of age may not possess a handgun.
(2) Except as provided by federal law, a minor under 18 years of age may not possess the following:
(a) a sawed-off rifle or sawed-off shotgun; or
(b) a fully automatic weapon.
(3) Any person who violates Subsection (1) is guilty of:
(a) a class B misdemeanor upon the first offense; and
(b) a class A misdemeanor for each subsequent offense.
(4) Any person who violates Subsection (2) is guilty of a third degree felony.