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Old March 14, 2008, 08:19 PM   #1
surg_res
Senior Member
 
Join Date: September 29, 2005
Location: Texas, 5th GEN!
Posts: 621
What exactly makes a M1A barrel National Match?

Can anyone explain the difference between the NM and standard M1A barrels? I understand the difference in most of the other components but what about the barrels. Is it a manufacturing difference, testing differnece, materials, marketing...? The rate of twist seems the same. SA doesn't say much on their website. Thanks.
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