"a" vs "any"

What is the difference between and any in the following sentenc?

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

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"?

 

Suppose I have got 3 bulletproof vests. After shooting bullets into them from an AK-47, none is able to stop those bullets. Then can I say "Hey John, Can any bulletproof vest stop a bulltet fired from an AK-47? What do you think?" Does any in this context mean "Does there exist a single bulletproof vest that can stop a bullet fired from an Ak-47?"
 
 
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