The term 'shotgun type' refers to a type of firearm that is designed to fire multiple projectiles at once. It is also known as a scattergun, and it is typically used for hunting or self-defense. The term 'DOUBLE' in this context refers to the two barrels of the shotgun, which are usually side-by-side. This type of shotgun is popular among hunters because it allows them to fire multiple rounds at once, increasing their chances of hitting their target.