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What Is The Highest Caliber A Bullet Proof Vest Can Stop? [Solved]

Wow! This Level IV Armor from Armored Republic is seriously tough stuff. It can stop a .30 caliber armor-piercing bullet, weighing 10.8g, traveling at up to 2,880 ft/s. That’s the same kind of protection the U.S. Military uses - they call it M2 AP (30.06).