枪刺

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

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

• 朿(sharp thorn; prickle)PHONETIC
• 刂(knife (radical))RADICAL

Using a knife to stab into a sharp thorn—that is the action of piercing.