Many types of variants to the flintlock exist, from the most basic pistol, to the more powerful rifle. Ever since the first invention of the flintlock, many types of variants have existed, including pistol-dagger combinations, and larger muskets.
During the "age of piracy", many naval and infantry weapons were produced that used the flintlock design, one of which being the flintlock-pistol-dagger combination, which was a medium-sized knife that included the flintlock parts integrated into the handle and the side of the weapon, enabling the wielder to fire a bullet, and easily defend with the blade.
Axe-flintlock-pistol combinations were also made, many of which came out of Germany, they weren't as heavily used as other designs, but were still used for defense in many areas. They normally had an axe head near the tip of the barrel.
Main article: Blunderbuss
Another variant of the flintlock was the blunderbuss, which was a smaller version of the flintlock rifle, which included a flared, trumpet-like barrel; the blunderbuss, for this reason, as well as its usage, was the predecessor of the modern shotgun.
Another variant was the revolving flintlock, a type of flintlock with multiple barrels (or cylinders) which held bullets and powder, and would revolve upon firing, making it easier to fire more bullets in battle. The first patented revolving flintlock was in Britain during 1818.