Install new lower barrel, place new snap ring and new flange on the new lower barrel, fixed by bolt nut.

安装新埋管，把新卡环和新法兰套进新埋管里，用螺栓螺母与法兰固定。

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Install upper barrel, fixed by break flange and bolt nut.

安装上体，用断开法兰和螺栓螺母固定。

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By using the finite element method, the dynamic stress caused by vertical contact impact between bolt locking surface and barrel extension locking surface of a new rifle was studied.

采用有限元方法研究了某新型自动步枪枪机闭锁面与节套闭锁面间垂直接触碰撞的动应力。

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All the other parts are purchased and the critical components like the barrel and bolt and springs are all metal.

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