轻机枪

• 車(vehicle; cart; car)RADICAL
• 巠(underground water stream; subterranean water)PHONETIC

A light vehicle running smoothly on the road conveys the meaning of lightness.

• 木(wood; tree)RADICAL
• 仓(granary; grain storage)PHONETIC

Old guns were made of wood, and the sound is similar to "thương" (warehouse).