Abstract: A gun includes a receiver assembly, a magazine, a trigger assembly, a sear assembly, a blowback assembly and a reciprocating slide. When the trigger rotates, the first connecting member is capable of pulling the trigger slide to move linearly, and driving the second connecting member, the sear assembly and the force-storing slide to move linearly towards the same direction. Moreover, the force-storing slide compresses the blowback spring, and the blowback slide receives a restoring force of the blowback spring to drive the reciprocating slide to move backward. The gun could achieve a simulation effect of rotating actions of the trigger, as well as a simulation effect of blowback actions of the reciprocating slide.