鉛徑（英語：Gauge）是度量霰彈槍槍膛膛徑的單位。鉛徑是直徑為所測槍膛徑的鉛制球體的以磅為單位的質量的倒數，也就是一磅的鉛可製造的直徑為所測槍膛徑的球體的個數。例如，一個1/12磅的鉛球的直徑對應一把12鉛徑的槍的膛徑。[1]因此一把槍的鉛徑越小，其膛徑越大。
參考文獻
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