The seven barrels on the gun were fired at once and were designed for war at sea. But the force of shooting seven bullets pushed the gun violently backwards, and it was so strong that it could break your shoulder, especially if you were shooting from the ship's sails. That's because you'd have no solid footing to absorb the kick. So, the force would travel directly into your bones, and it could even knock you right out of the ropes, meaning you'd break more than just your shoulder.
