 The cylinder is an adaptation of a commercial 'Kosangas' gas cylinder, for heating and cooking gas, used in rural areas in Ireland.It was first used in an attack on 7 December 1992 against an RUC/British Army base in Ballygawley, County Tyrone, injuring a number of Royal Ulster Constabulary officers.The barrack buster belongs to a series of home-made mortars developed since the 1970s.