The Seaslug system was a large weapon. Each missile was long and weighed two tons; its handling arrangements and electronics systems were also large; so even fitting a single system aboard a ship the size of the Counties was a challenge. The missiles were stowed horizontally in a long unarmoured magazine which was sited above the waterline and took up a great deal of internal space. The risk of fire near the magazine was checked by an automatic sprinkler system. In order to increase the number of missiles that could be carried, on the last four ships, some of the missiles were stored partly disassembled in the forward end of the magazine. Their wings and fins would be reattached before being moved into the aft sections of the handling spaces and eventually loaded onto the large twin launcher for firing.