Police on Tuesday raided a house in Bangkok Noi district and seized a rifle and ammunition.
Police detained Nuttapon Punsuwan, 23, a messenger with Thanachart Bank’s Lumpini branch, who lives on the third floor.
The search revealed an M16 rifle and 110 bullets as well as a BB gun.
Nuttaphon told police that the house belongs to a cousin and said the weapons belonged to two male friends. He added that the friends had said that they would pick up the weapons on Tuesday.
Police said they were charging Nuttapon with possession of weapons without a permit.