The doctors at the Combined Military Hospital (CMH) in Dhaka operated on Nabil, elder son of JMB kingpin Shaekh Abdur Rahman, Tuesday morning.
"He had an inch deep bullet wound on his forehead. The operation was successful," RAB sources said preferring anonymity.
Earlier, Nabil, aged about 17, was rushed to the CMH from 'Jannatul Shafi' his final hideout in Comilla after a fierce gun battle with the RAB on Monday that left four people including two infants dead.
Shakil, who was known as "Mollah Omar" of Bangladesh for his expertise in manufacturing bombs, was killed during the shootout with RAB while his wife and two minor children lost their lives in what the RAB said was a suicide attack.
The bodies of Molla Omar, his wife Saida Sumaiya and two infants, were sent to the Comilla Medical College Hospital for autopsy.
Meanwhile, a three-hour tense block raid in Khulna city by RAB Tuesday to arrest JMB Majlish-e-Shura members Salauddin and Khalid Saifullah was unsuccessful.
Sources said about 200 RAB personnel, led by Director of RAB-6 Lt Col Shams-ul-Huda, cordoned off five roads, southern part of Khulna Circuit House, at about 10 am and searched every house in the areas, but did not find the dreaded militants.
According to Shams-ul-Huda, the anti-crime elite force, acting on a tip-off, conducted the drive at Khan A Sabur Road, Haji Mohsin Road, South Central Road, Fire Brigade Road and Babu Khan Road to capture Salauddin and Saifullah.
They also set up check posts at all city entrances.
Having failed to hunt down the two JMB men, RAB declared its drive over at about 1.0pm.