A pistol device includes a handgrip portion having a grip body defining an accommodation space, a snap hole extending through a front side of the grip body, and two positioning holes extending through left and right sides of the grip body. The snap and positioning holes communicate with the accommodation space. A magazine base is detachably disposed on a bottom end of the handgrip portion, and includes a surrounding wall, a snap block detachably engageable with the snap hole, and a connecting portion connected to the surrounding wall and having at least one pin hole extending therethrough. A positioning pin is detachably inserted through the positioning holes and the pin hole to fix the magazine base to the handgrip portion.