枪膛(英语:Bore)是枪管空腔内壁的主体部分,处于后方的膛室和前方的枪口之间。枪膛的主要作用是发射子弹时容纳推进药燃烧产生的高温高压气体,积蓄压力为弹头提供向前加速,并且稳定弹头的移动方向和状态,以便提高射击的准确度。枪膛内壁锻有膛线的枪械称为线膛枪,没有膛线则称为滑膛枪

刻有膛线的枪膛

弹头在枪膛内的运动状态被称为内弹道

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