A MAN allegedly trying to pluck up the courage to kill himself yesterday fired seven shots into the walls and floor of a Tai Po housing estate. He surrendered when neighbours called police. Police said the man would be charged with possession of firearms and ammunition - two Chinese-made 7.65 millimetre calibre Black Star semi-automatic pistols and 15 rounds of ammunition - without a licence. The shots were fired on the staircase between the 33rd and 34th floor of Wan Loi House, Wan Tau Tong Estate. A resident saw the man holding a pistol to his head on the staircase. She called the police shortly afterwards when she heard a shot at about 8.15 am. Tai Po police divisional commander, Superintendent David Carver-Trotter, said the 24-year-old man was sitting on the staircase holding a gun when police arrived. ''He dropped the gun and surrendered when he saw the police,'' he said. Police were told the man, who is believed to be heavily in debt, was working up the courage to kill himself. The suspect told police he had thrown another pistol out of the building at 5 am. Officers found a damaged pistol on the ground outside a refuse collection point. The magazine, loaded with seven rounds of ammunition, was found in a nearby waste bin. Five live rounds were found inside the pistol allegedly used in the shooting and three other rounds on the staircase. The man lives in a flat on the 26th floor with his parents and sister. The ex-delivery worker has been unemployed for a year. Assistant district commander, crime, of Tai Po, Detective Superintendent Lo Mung-hung, said police were investigating whether the story given by the suspect was true.