The accused identified as Lakhveer, Pradeep, Anand and Manjeet were arrested last night when they came to meet inmate Daulat Ram imprisoned in connection with a case of dacoity in Udaipur jail, police said.
The police have recovered a revolver, ten live cartridges and Rs 1.10 lakh from their possession and have also seized a vehicle with red beacon.
The accused have been booked under The Arms Act and police is further probing the issue, they said.