The blunderbuss is a firearm with a short, large caliber barrel which is flared at the muzzle and frequently throughout the entire bore, and used with 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 and defensive use.[2] 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.
You can use a weapon that has the Ammunition property to make a Weapon Ranged Attack Roll only if you have Ammunition to fire from the weapon. Each time you Attack with the weapon, you expend one piece of Ammunition. Drawing the Ammunition from a Quiver, case, or other container is part of the Attack (you need a free hand to load a one-handed weapon).