Police believe it was hidden in the Hunghom restaurant as part of an arms deal A semi-automatic pistol was found yesterday in the toilet cistern of a McDonald's restaurant in Hunghom. Detectives believe the mainland-made gun was planted in preparation for an arms deal. A cleaner found the gun at about 9am in the male toilet of the restaurant next to Whampoa Garden. Ballistics experts said it was a 9mm Type 59 pistol, the Chinese version of the Russian-made Makarov that was widely used in formerly communist eastern Europe. Production of the Type 59 on the mainland is believed to have ceased and it is no longer used by authorities. Assistant Hunghom divisional commander (crime) Chief Inspector Chung Chi-ming said the unloaded pistol was inside two plastic bags. 'Our ballistics experts told us that the pistol is in good condition and serviceable,' he said. The gun is being examined to find out whether it has been used recently or is linked with any shooting case. Detectives believe that it had been in the toilet water tank for less than 24 hours, as the cleaner did not see it when the tank was checked about noon on Sunday. 'The gun was apparently hidden in the water tank waiting for its buyer to come and collect it,' a police source said. He said the fast-food restaurant might have been chosen as the site for an arms deal 'because there is no closed-circuit television inside, it is convenient and accessible'. A handgun in good condition costs about $5,000 on the black market but a homemade pistol can be bought for as little as $2,000, a police source said. Police said there was no indication yet that the pistol was linked with the execution-style killing of a Dutch tourist at a restaurant in Oi Man Estate, Hunghom, on February 3. A suspected hitman, who is a 38-year-old Hong Kong resident, was arrested in Zhuhai on February 19. He is the fifth suspect arrested in connection with the murder but the weapon has not been found. On February 20, insurance company executive Joe Cheng Kwok-shing, 49, was shot in a restaurant at Causeway Bay during an alleged robbery. He is still recovering in Queen Mary Hospital. No one has been arrested. Yesterday's discovery also follows a case on Sunday evening in which a police officer fired a shot in an attempt to stop a car after it rammed a police van and sped off after the occupants were involved in a fight outside Tseung Kwan O Village on Po On Road. No one was hit by the bullet. An injured man, 22, was arrested after he was found outside the village. The car was later found abandoned in Kai King Road near King Lam Estate. Yesterday, officers arrested four men, aged 26 to 34, in Ngau Tau Kok in connection with the fight. The older man was also arrested for furious driving. Last night, the five suspects were being held for questioning.