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Old February 14, 2013, 02:35 AM   #10
Gazpacho
Senior Member
 
Join Date: May 20, 2004
Posts: 557
Ask the manufacturer.

The ammo oracle is your friend.
http://www.ar15.com/ammo/project/hist_diff.html

So long as the action is strong enpugh for the additional pressure, it would not be difficult to have the throat lengthened and the rifle perfectly safe for 5.56 nato ammo.
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