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Product ID Code: 300433

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Cannot Ship to New York state
Cannot Ship to Connecticut




The open-tipped rounds until now have been
available only to Special Operations Command troops. The first 200,000
5.56mm Special Operations Science and Technology rounds are already
downrange with Marine Expeditionary Brigade-Afghanistan, said Brig. Gen.
Michael Brogan, commander of Marine Corps Systems Command. Commonly
known as “SOST” rounds, they were legally cleared for Marine use by the
Pentagon in late January, according to Navy Department documents
obtained by Marine Corps Times.

SOCom
developed the new rounds for use with the Special Operations Force
Combat Assault Rifle, or SCAR, which needed a more accurate bullet
because its short barrel, at 13.8 inches, is less than an inch shorter
than the M4 carbine’s. Using an open-tip match round design common with
some sniper ammunition, SOST rounds are designed to be “barrier blind,”
meaning they stay on target better than existing M855 rounds after
penetrating windshields, car doors and other objects.

The Federal T556TNB1 is the commercial designation for the MK318 round. The
62 grain bullet was designed by Federal / ATK and features an open tip
with lead at the front and a thick copper base. The lead is designed to
defeat barriers and the copper to penetrate the barrier.



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