Safety pin mechanism in double action triggers

1. A safety pin mechanism in double action triggers, comprising a body, a trigger and a trigger locking pin, wherein the trigger locking pin comprises a first axis, a second axis, a pin's remaining part, a round core connection part, a basement part, a sharp tip, a lower base, a lower part and a tip part, wherein the safety pin mechanism is scaled based on the first axis; a positioning of the first axis is 1.2 millimeters below a top of the pin's remaining part; the pin's remaining part is placed in the body; the first axis horizontally passes through a center of the round core connection part; the round core connection part is connected to the trigger and the trigger locking pin; a wall of the basement part of the trigger locking pin abuts in the body to provide a safety; the basement part is designed to make 3 degrees angle with the first axis; the basement part is 0.8 millimeters below the second axis; the sharp tip of the trigger locking pin is designed to make an 18 degrees angle with the first axis; a first distance between the sharp tip of the trigger locking pin and the center of the round core connection part is 8.5 millimeters; the sharp tip holds on the body, and the trigger locking pin is in front of the trigger in involuntary trigger pressing actions; a second distance between the lower base and the center of the round core connection part is 4.5 millimeters; the second axis is parallel to the basement part; the second axis passes through the center of the round core connection part; a top of the lower part is 2.5 millimeters away from the second axis; a third distance between the tip part and a front of the lower part is a total measure of 32.2 millimeters, wherein the lower part forms the trigger; and the tip part stays in the body.