The alleged shooters - Gaurav Bhati, Nilesh, Shiva, Ashish - were arrested yesterday, police said.
A pistol, two country-made pistols, a knife, and two stolen motorbikes were recovered from them.
On interrogation they revealed they were members of the gang and were going to kill Ravi Nagar, a resident of Dadopur, police said.
Ravi was a witness in the murder case of his brother, Harinder Pradhan, who was killed in 2015.