膛径

膛径（英語：）指枪膛的直径，也就是枪管内面的直径，亦为枪械的口径。膛径是一个阳膛（凸起的膛线）经枪膛中轴到对面阳膛的距离，也就是枪管在未刻膛线时的内径。[1]

参考文献
  1. Carter, Greg Lee. . Santa Barbara, Calif.; Oxford: ABC-CLIO. 2002: 361. ISBN 978-1-57607-268-4.
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