| 摘要 |
A trigger has a body, two adjusting buttons, a connecting shaft, a pressing tab and a torsion spring. The body has a back, two sidewalls and two elongated slots. The adjusting buttons are slidably mounted respectively in the elongated slots and are connected to each other with the connecting shaft. The pressing tab is rotatably mounted around the connecting shaft and has a connecting segment, a first pressing segment and a second pressing segment. The first pressing segment is formed on and protrudes from the connecting segment and has a first distance to the back of the body. The second pressing segment is formed on and protrudes from the first pressing segment and has a second distance to the back of the body being different from the first distance of the first pressing segment.
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