Which factor most directly increased the killing power of first crossbows using small cast bronze trigger mechanisms during the Warring States period?

💡 Explanation

Metallurgical processes allowed bronze to be cast with greater precision and tensile strength during the Warring States period; because improved control influenced metallurgy, the complex multiple-part lock mechanism could consistently withstand greater loads. Therefore, it allowed for greater draw weight and projectile force, rather than bowstring or arrow properties.

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