Abstract: This invention relates to an improvement configuration of a nailing gun magazine specially designed for a big nail set. An anti-slip nut is used between the nail magazine and muzzle in order to reinforce their fastening strength and prevent them from being loosened. It also uses a .pi.-shaped reinforcement rib on the end face of the nail magazine that is correspondent to work piece. It can achieve better anti-collision ability and is resistant to deformation. Furthermore, a nail pushing segment sliding channel is fitted in the nail magazine. It can fix the coil of a coiled-spring to the end face of this sliding channel in order to locate the coiled spring out of the nail set piercing & loading hole.