 The as-built armament included two /50 caliber Mark 6 guns, six /50 caliber rapid fire (RF) guns, and two 21 inch (533 mm) torpedo tubes.The original design featured a uniform gun armament of twelve 3-inch guns, which was supported by the Navy's General Board as simplifying fire control and echoing the uniform main and secondary armaments of dreadnought battleships.However, two 5-inch guns were substituted for six of the 3-inch guns, apparently to enable the scout cruisers to fight foreign light cruisers.