Which of the following would be considered a 'destructive device' under federal law?

A grenade is classified as a 'destructive device' under federal law because it is a type of explosive weapon designed to be thrown by hand or launched, which can cause significant injury or destruction upon detonation. The Legal definition often includes items that are designed to expel a projectile by means of an explosive or incendiary charge. Unlike other choices, which are conventional firearms used primarily for hunting or personal defense, a grenade is categorized due to its capability to inflict mass harm over a wider area and its specific design for explosive action.

In contrast, traditional hunting rifles, shotguns, and standard pistols are classified as firearms and are used for sporting and self-defense purposes. They do not possess the characteristics inherent to destructive devices, which typically indicates a greater potential for causing widespread damage.