Police arrested three men and a woman, and seized a stolen gun as well as drugs and ammunition outside a notorious block of flats in Bellville last week.
The four had been sitting in a stationary silver VW Golf GTi outside Parksig Villas.
Paksig Villas is a known crime area, with illegal activities such as drugs, prostitution and the selling of stolen property taking place.
Officers swooped on the car at noon on Wednesday September 27, turning up the gun and the drugs when they searched the vehicle, said Bellville police spokeswoman, Warrant Officer Henrietta van Niekerk.
The 9mm Browning pistol had been reported stolen in East London.
The four occupants of the car were arrested for possession of drugs and a stolen firearm.