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Old February 2, 2005, 05:39 PM   #2
shaggy
Senior Member
 
Join Date: October 9, 2004
Posts: 1,519
The 5.7 round (and actually any ammunition) is determined to be armor piercing based upon its composition. I don't have the federal statute in front of me now, but IIRC if the bullet is consrtucted with more than a certain percentage of copper, steel, nickel, etc. it is considered to be armor piercing.

As far as getting your barrel threaded, you can have anyone do it. There are no longer any federal restrictions, but be sure to check into any applicable state laws that may preclude it.
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