What is classified as a firearm under relevant regulations?

The classification of a firearm under relevant regulations encompasses guns that are designed to shoot projectiles through the controlled explosive of gunpowder. This definition includes handguns like pistols and revolvers, as well as long guns such as rifles and shotguns. Firearms are distinguished by their capability to discharge ammunition that can inflict lethal force, which is a primary concern in the context of weapons training and application.

The other options do not meet the criteria for being classified as firearms. Knives and swords are edged weapons primarily used for cutting rather than propelling projectiles. Tasers and stun guns, while used for self-defense, do not utilize gunpowder to function and instead deliver an electrical charge to incapacitate a target. Crossbows and slingshots, although they can launch projectiles, operate through mechanical means rather than combustion and are generally not classified as firearms under most regulatory frameworks. Thus, the initial choice effectively captures the legally defined category of firearms relevant to lethal weapons training.