Abstract: A locking block is adapted to be mounted in a gun. The gun has a bias spring having a bias spring arm. The locking block includes two side bodies and a connecting body. The connecting body is connected between the two side bodies and has a bottom surface. The connecting body is formed with at least one positioning groove recessed upward from the bottom surface for catching the bias spring arm of the bias spring.

Abstract: A magazine catch is adapted to be mounted in a gun body and to be pressed for releasing a detachable magazine. The magazine catch includes a press member and a catch member. The press member has a first main body, and a press portion and a first engaging portion that are connected to opposite ends of the first main body. The catch member has a second main body, and a catch portion and a second engaging portion that are respectively connected to two opposite ends of the second main body. The catch portion is disposed for engaging with the detachable magazine. The second engaging portion and the first engaging portion are separably engaged with each other such that the catch member and the press member are co-movable.

Abstract: A firing pin system is adapted for underwater shooting and includes a firing pin, a blocking cap, a spring, and a rear sleeve. The firing pin has a striking tip portion, a linking end portion, and a rod body having a head section, a tail section, and a neck section interconnecting and being narrower than the head and tail sections. The blocking cap is sleeved on the neck section and has a flange that is formed with a plurality of notches adapted for allowing passage of water therethrough. The rear sleeve is sleeved on the tail section and has a plurality of outer guiding grooves. The outer guiding grooves are adapted for allowing passage of water therethrough.

Abstract: A firing pin system is adapted for underwater shooting and includes a firing pin, a blocking cap, a spring, and a rear sleeve. The firing pin has a striking tip portion, a linking end portion, and a rod body having a head section, a tail section, and a neck section interconnecting and being narrower than the head and tail sections. The blocking cap is sleeved on the neck section and has a flange that is formed with a plurality of notches adapted for allowing passage of water therethrough. The rear sleeve is sleeved on the tail section and has a plurality of outer guiding grooves. The outer guiding grooves are adapted for allowing passage of water therethrough.

Abstract: A magazine catch is adapted to be mounted in a gun body and to be pressed for releasing a detachable magazine. The magazine catch includes a press member and a catch member. The press member has a first main body, and a press portion and a first engaging portion that are connected to opposite ends of the first main body. The catch member has a second main body, and a catch portion and a second engaging portion that are respectively connected to two opposite ends of the second main body. The catch portion is disposed for engaging with the detachable magazine. The second engaging portion and the first engaging portion are separably engaged with each other such that the catch member and the press member are co-movable.

Abstract: A locking block is adapted to be mounted in a gun. The gun has a bias spring having a bias spring arm. The locking block includes two side bodies and a connecting body. The connecting body is connected between the two side bodies and has a bottom surface. The connecting body is formed with at least one positioning groove recessed upward from the bottom surface for catching the bias spring arm of the bias spring.

Abstract: A slide stop lever adapted to be disposed in a gun body, and has a pivoting section adapted to be pivoted to the gun body, and a latching section extending rearwardly from the pivoting section. The latching section has a rod portion extending rearwardly from the pivoting section, a latching portion protruding from the rod portion, and a pushed portion protruding from the rod portion and located lower than a top of the rod portion. The pushed portion is adapted to be pushed upwardly to move the latching section upwardly from an initial position to an abutment position, where the latching portion is adapted to be received in a latching groove of the Glock 43 series slide to prevent forward sliding movement of the Glock 43 series slide.