noun
Technical term for the rotating cylinder that holds cartridges in a revolver.
リボルバーの回転弾倉には六発の弾が装填できる。
The revolver's cylinder can hold six rounds.
リボルバー refers to the entire revolver firearm, while 回転弾倉 specifically denotes the cylinder component.
Compound of 回転 (rotation) and 弾倉 (magazine), literally 'rotating ammunition magazine'.