What's a 'blunderbuss'?

Increase your vocabulary and you’ll make your writing more precise. That's why I provide a word of the week. Today's word: blunderbuss

Old World Stopping Power: Blunderbuss & Coach Guns

File:Brass Flintlock Blunderbuss, UK, C.1700s (48708532636).jpg - Wikimedia Commons

Blunderbuss Gun & Sport

Flintlock Blunderbuss Pistol

Bonhams : A Brass-Barrelled Flintlock Blunderbuss With Spring Bayonet

Why did the blunderbuss have a horn on the end of the barrel? - Quora

18th Century British Flintlock Blunderbuss Pistol - Brass - Atlanta Cutlery Corporation

Museum Minute: The Blunderbuss, Oklahoma

ArtStation - Spanish Miquelet Blunderbuss Pistol