The blunderbuss is a 17th- to mid-19th-century firearm with a short, large caliber barrel which is commonly flared at the muzzle, to help aid in the loading of shot and other projectiles of relevant quantity or caliber. The blunderbuss is commonly considered to be an early predecessor of the modern shotgun, with similar military usage. It was effective only at short range, lacking accuracy at long distances. A blunderbuss in handgun form was called a dragon, and it is from this that the term dragoon evolved.

A shotgun is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which discharges numerous small spherical projectiles called shot, or a single solid projectile called a slug. Shotguns are most commonly used as smoothbore firearms, meaning that their gun barrels have no rifling on the inner wall, but rifled barrels for shooting sabot slugs are also available.