D assembly FE modeling and dynamic elastoplastic analysis are carried out for the obturator structure of a floating gun breech mechanism by using nonlinear finite element code MSC MARC.

利用大型非线性有限元MARC ，对某自动迫击炮浮动炮闩闭气结构，进行了三维装配体有限元建模和动态弹塑性分析，获得了关键闭气构件的应力、塑性应变和变形的动态响应。

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But for federal authorities trying to put a stop to 3-D gun files, sharing it might already be too little, too late.

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Lawmakers in California, the District of Columbia, as well as a handful on Capitol Hill said they intend to fight block 3-D gun printing technology.

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Regulations that the government alleges Wilson violated would require approval for the design, development, production, manufacture, assembly, operation, repair, testing, maintenance or modification of firearms including blueprints, drawings and plans, or just about every aspect required to print a gun using a 3-D printer.

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