The incident took place last evening when an argument broke out between Omprakash and Indrapal over a piece of land following which the groups led by them entered into a scuffle.
Indrapal and his brother Chandrapal opened fire, injuring Omprakash while Bhagwan Singh, Ajab Singh and Atara Singh were beaten up, they said.
The four injured persons were admitted to a hospital, they said.
Saket police have registered an FIR against Indrapal, Chandrapal, Somdev, Jogendra and Amarpal.
The matter is being investigated, they said, adding that no arrest has been made in this connection so far.