hammer

/ˈhæmər/

the part of a gunlock that strikes the percussion cap when the trigger is pulled

Chinese meaning: 击铁；撞针

The gun's hammer struck the cartridge, firing the bullet.

枪的击铁撞击弹药筒，发射了子弹。

He carefully inspected the hammer mechanism of the antique pistol.

他仔细检查了古董手枪的击铁装置。