Acting on a tip off, a police team raided Binda diara and unearthed the minigun factory, Superintendent of Police Barun Kumar Sinha said.
A large quantity of arms comprising 10 automatic pistols, 20 magazines and equipment used for processing weapons was recovered from the spot, he said.
The cops also arrested five persons identified as Pankaj Rai, Md Meraj, Md Faiyaz, Md Shahid Alam, and Md Pervez Alam, from the illicit minigun factory site, Sinha said.