Acting on a tip-off, BSF's 10 battalion troops launched an operation at Barpathar railway station and apprehended the arms dealer while he was disembarking from the Lumding-Tinsukia passenger train.
The apprehended arms dealer was identified as Nick Suni (21), a resident of Dimapur in Nagaland.
During interrogation, Suni said he was working for NSCN (IM).
Security forces seized a 9mm pistol, one magazine and three lives rounds of ammunition for him.