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 Oregon, a firearm is defined under ORS 166.210 as any weapon that can expel a projectile by the action of gunpowder or any other explosive force. This broad definition typically includes rifles, pistols, and shotguns. Oregon law also considers certain firearm accessories, such as silencers, as regulated items. Under federal law, the definition of a firearm is similar and can be found in the Gun Control Act of 1968, which includes any weapon which will or is designed to or may readily be converted to expel a projectile by the action of an explosive, and the term also encompasses the frame or receiver of any such weapon, as well as firearm mufflers and silencers. It's important to note that both state and federal laws have specific regulations regarding the possession, transfer, and use of firearms and related accessories, and these laws are subject to change, so it is advisable to consult with an attorney for the most current legal guidance.