| CPC F41A 3/10 (2013.01) [F41A 3/72 (2013.01)] | 8 Claims |

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1. A locking block adapted to be mounted in a gun, the gun having a bias spring that has a bias spring arm, said locking block comprising:
two side bodies; and
a connecting body connected between said two side bodies and having a bottom surface, said connecting body being formed with at least one positioning groove that is recessed upward from said bottom surface, the at least one positioning groove being defined by at least one curved recessed surface for catching said bias spring arm of said bias spring.
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