A shotgun with two parallel barrels, either aligned side by side (S×S) or over and under (O/U).
They are commonly available in break action mode. Early ones have two triggers, allowing one to fire both barrels at once, while the later and modern models only have a single trigger capable of firing one barrel after another in quick succession.
Users are not supposed to create specific tags for real-world or fictional models of weapon, since they are often extremely identical to each other.
