Normally, once each barrel has fired 100 rounds it becomes too hot and is therefore replaced with a spare barrel.

The shotgun flew out of his hand and the second barrel fired.

Indeed, not just one barrel fired, but all fifteen; they were not supposed to, but that was what happened.

It also has automatic ejectors, and a selectable trigger that allows the shooter to choose which barrel will fire first.

Even so, I probably would have survived the impact a good deal better had not both barrels fired simultaneously.

Each barrel could fire two rounds per minute.

The barrel the operator fired was chosen by selector, or could fire both together.

The neighbor grabs the shotgun and ties the barrel around Elmer's head, then fires the gun before leaving.

That slug heated the barrel, which led to slightly different ballistics for every other shot fired.

When in use, the gun's barrel opens up to look like a flower and fires a powerful fireball.