unlocking armor-piercing rounds help

im trying to unlock armor piercing rounds in single player, and i cant quite get it. can anyone help me with tips on the perfect **** rifle to use, or provide a link to a guide that tells how to do it? thanks

 

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Last updated July 3, 2018 Views 2 Applies to:

Hey maybe this will help www.xbox360achievements.org/.../showthread.php has video walk trough for all tac challenges.