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把你的22枪管crown拍个清楚点的看看
http://en.wikipedia.org/wiki/Accurizing#Crown
The crown is the muzzle face of the barrel. The crown's integrity is critical for two reasons:
It is the last part of the firearm touched by the bullet before it exits.
As the bullet clears the crown, it will release upwards of 5,000-10,000+ PSI of back pressure, which must be as uniform as possible.
While many barrel manufacturers recess the crown to protect it from accidental damage, it can still be damaged over time by cleaning rods that are too hard. It is also not uncommon for factory crowns to be cut slightly off-center, so that one side of the bullet exits slightly earlier than the other, and this will result in the bullet being pushed away from that side, causing a significant deflection in its path. A crown may be re-cut with relative ease, and this can fix any problems caused by a defective or damaged crown, by ensuring an even release of the bullet.[40] |
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