caliber machine guns meaning in English

五十口径自动步枪

Structure dynamic modeling of large caliber machine guns
大口径机枪结构动力学建模方法研究
Study on low recoil floating technology of large - caliber machine gun
大口径机枪低后坐浮动技术研究
The experimental study on the floating technique of large caliber machine gun
大口径机枪浮动技术试验研究
Caliber machine guns
五十口径自动步枪
Calculation of the pressure of the internal trajectory and the gas - operated chamber of the heavy caliber machine gun
大口径机枪内弹道及导气室压力的计算