Difference between “a” and “any”: “Can a/any bulletproof vest stop a bullet…?”

Question

What is the difference between a and any in the following sentence?

Does the second one using any mean to say "Does there exist a single bulletproof vest that can stop a bullet fired from an Ak-47"?

Khushraj Rathod · Accepted Answer · 2019-01-01 09:58:27Z

In this context, both 'a' and 'any' mean more or less the same. However,

Can a bulletproof vest stop a bullet fired from an AK-47?

This means -

Is every bulletproof vest capable of stopping a bullet fired from an AK-47?

Can any bulletproof vest stop a bullet fired from an AK-47?

This means -

Is there even one bulletproof vest capable of stopping a bullet from an AK-47?

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