Feast yar eyes on the Pirate Fashions Blunderbuss! The ideal weapon for clearing a deck o' enemy sailors, sometimes it be called a Musketoon. This basically be a short, carbine-like musket with a flared barrel. While we discuss the blunderbuss we can bust a few myths!
Because o' its flared barrel-end it is assumed that its primary purpose was that it was a shotgun style weapon, in reality the flared barrel allows the shooter to easily load a weapon with shot. While at sea or on horseback it made loading the weapon much easier because ye could dump your ammo into the barrel without worrying about precision. They were shortened muskets essentially so that also helped with loading. They were indeed great compact weapons for close quarters, but their shotgun status should be regarded with some skepticism. If the barrel's flare had an effect on the shotgun's spread we would see more flared barrels today.
We also have a false perception that "anything" could be loaded into a blunderbuss, but the barrel would not last long firing silverware or debris- ye would destroy it internally. With most blackpowder weapons ye could actually load multiple rounds o' shot into the muzzle (two was recommended if ye were to do so.) Ye could fire multiple metal balls with a musket, pistol or blunderbuss. Ye could also load buckshot (numerous small balls) into a weapon n' use it in a shotgun capacity, similar to how a ship's guns could fire Grapeshot.
Arrr Armory has Firing Blunderbusses from most of the Colonial powers in the Spanish Main, n' we also have non-firing replicas- less expensive, but purely for prop usage. Browse Arrr Selection, we've for English, French, Dutch n' Spanish! http://bit.ly/2raJ4vK