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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The testing methods on extension of anchor bolt are introduced. The whole deformations of normal bolts under pretensioning and its effect on the jacking of surrounding rock are pointed out.

通过对锚杆延伸性能测试方法的介绍，计算出了几种常用锚杆在预紧加固条件下的整体变形量，并结合井下实用情况指出不同性能锚杆对围岩加固的影响。

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