Under the action of tensile stress and tensile stress, the bolt with relatively low strength will crack first, and then the fatigue fracture will occur.

在拉应力和应拉力交替的作用下，强度相对较低的螺栓会先产生裂纹，进而发生疲劳断裂。

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The BRG-15 had conventional, gas operated action with rotating bolt, locking into the barrel extension.

该担心现有- 15接受传统，燃气经营与旋转螺栓行动，延长锁入桶。

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In this action bolt has two frontal lugs that engage the barrel extension, which is screwed onto the barrel.

螺栓在这次行动中有两个是从事前沿耳桶扩展，这是到每桶拧。

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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

In 1963, Lee Harvey Oswald bought a bolt-action rifle an Italian military-surplus weapon for nineteen dollars and ninety-five cents by ordering it from an ad that he found in American Rifleman.

NEWYORKER: Battleground America

Authorities also seized a bolt-action rifle, a .22-caliber rifle, a Marksman BB gun and a .22 revolver starter pistol, along with nine knives of varying sizes, a nearly 7-foot-long pole with a blade on one end and a spear tip on the other, and three samurai swords.

WSJ: Arsenal Found in Newtown Gunman's Home