mp9伸缩抵肩器 airsoft mp9 retractable stock 炸鸡工坊设计 3D model preview
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需要平头m4x10螺丝两颗,线径1.5x外径17x长度20弹簧一个,m3x30螺丝两颗,m4x35长螺丝,厚度4mm,宽度11mm,长度200mm,开槽宽度1cm的金属扁杆两根,螺母若干