Fig. 5: Most tarnished spring after corrosion test and not tested spring pin for reference.

图5：腐蚀试验后大部分有痕迹的弹簧和没做过试验弹簧引线对比。

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The utility model is composed of a percussion device body, a piston, a percussion spring, a limiting pin, a shutter, a shutter torsion spring, a shutter pin, a torsion spring pin, etc.

它由击发器体、活塞、击发簧、限位销、活门、活门扭簧、活门销、扭簧销等部件组成。

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Spring, like hairs, like a flower pin, like filaments densely twill weave.

春雨，像牛毛，像花针，像细丝，密密地斜织着。

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The government may simply insist that 3D printer manufacturers install software that prevents printing of a hollow cylinder of a certain size, a firing pin, or a certain type of spring.

FORBES: Five Reasons Gunmakers Have Nothing To Fear From 3D Printed Guns