18 U.S.C. Chapter 44, Section 921 defines a firearm as The term "firearm" means (A) any weapon (including a starter gun) which will or is designed to or may readily be converted to expel a projectile by the action of an explosive; (B) the frame or receiver of any such weapon; (C) any firearm muffler or firearm silencer; or (D) any destructive device. Such term does not include an antique firearm.
Bow and Arrow- Yes
Muzzle Loader- No