A firearm is generally a rifle, pistol, shotgun, or other portable weapon that expels a projectile (bullet) by use of an explosive action. The definition of a firearm may vary from state to state under state statutes—and under federal statutes—and related items such as a muffler or silencer may be included in the definition of a firearm for purposes of certain criminal offenses (crimes).
In Idaho, firearms are defined under state law in a manner consistent with the general description provided. Idaho Code § 18-3302 defines a firearm as any weapon from which a shot is discharged by gunpowder. This includes rifles, pistols, and shotguns, among others. Idaho does not require a state permit to purchase firearms, and there is no firearm registration or licensing of owners required. Additionally, Idaho is a 'shall issue' state for concealed carry permits, meaning that the issuing authority must issue a permit if the applicant meets certain criteria. Regarding firearm accessories such as silencers, Idaho follows federal law, which regulates these items under the National Firearms Act. Under federal law, silencers are considered firearms and require registration with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). It's important to note that while Idaho state law is generally permissive regarding firearms, federal law still applies within the state, and individuals must comply with all applicable federal regulations concerning firearms and related items.