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The medium level protects against sub machine guns such as mini Uzis.
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Mini Uzi, a 9mm submachinegun with a 7 3/4" barrel.
Quote:
the high level protects against high powered assault rifles and machine guns like the MP5.
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MP5, a 9mm submachinegun with a 8.9" barrel.
Seems it's that last inch or so of barrel that turns a 9mm subgun into a "high powered assault rifle and/or machine gun".