A shotgun, also called a "scattergun", is a firearm designed to shoot a multitude of projectiles with a single pull of the trigger. This makes it very effective at hunting game, greatly increasing the weapon's hit potential. However, the accuracy and power found at close range diminish rapidly as you get farther away from the target. Shotguns designed for military use are often called "combat shotguns".
The caravan shotgun is a short shotgun in which one barrel is mounted on top of the other, also known as an 'over/under' shotgun. The iron sight is a screw which holds the action release lever to the receiver.