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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That "responsible gun owner" politicians talk about, the one who reverentially passes down to his son the bolt-action rifle his father gave him?

CNN: Not man enough? Buy a gun