Side-by-side barrels
A shotgun with two parallel barrels, either aligned side by side (SxS) or over and under (O/U).
Commonly, they are operated with a break action and sometimes are sawed off. 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.
This tag implicates shotgun (learn more).
