Not surprising. I’ve never seen bullet resistant glass rated for anything bigger than 7.62 and even then multiple hits in the same location will penetrate it.
Armor piercing .50 will go through an engine block; or at least into it. https://youtu.be/QsgwcDOGJQY?t=5
An armor piercing WWII 30-06 round will too.
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Never tried it but it would be awesome to try!
There was a manufacturer who built a .22 caliber full auto. Small caliber, but even a steady strike from .22 caliber will eat it’s way through many obstacles. https://youtu.be/v8TmU5bXZ9M?t=5 I had a shot at buying one, but too $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$