Once the McConvilles moved into the complex, they were introduced to something that local residents called ‘the chain’. When police or the army came to the front door of a particular flat in search of a weapon, someone would lean out of the back window of the flat and pass the gun to a neighbour who was leaning out of her back window in the next flat. She would pass it to a neighbour on the other side, who would pass it to someone further along, until the weapon had made its way to the far end of the building.