The introduction of rifling, or cutting grooves, into a barrel had already improved accuracy, but the weapons remained difficult to load and clean.

人们将来复线（膛线）引入枪管之后提高了射击的精确度。但是装弹和清膛仍然很麻烦。

youdao

The introduction of rifling, or cutting grooves, into a barrel had already improved accuracy, but the weapons remained difficult to load and clean.

人们将来复线（膛线）引入枪管之后提高了射击的精确度。但是装弹和清膛仍然很麻烦。

youdao