DIY的消音，效果不错
打的4孔，取下第一个堵环，重新做了一个，上面开孔和车丝，实现一体化，做的是5个内挡板。效果还不错，没上消音响声回荡山谷，上了后像放了响屁，20米外应该是听不见声音，不知道算消了多少？没有专业设备测分贝，估计有70%左右吧。4.5的，40米测试精度硬币，不影响精度。
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