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AR15.COM
7/1/2008 5:02:09 PM EDT
deleted thanks
7/1/2008 5:10:59 PM EDT
[#1]
5.556 nato. all colts are always 556 . what the barrel says is what it is. if it is a colt barrel it is 556
7/1/2008 5:53:33 PM EDT
[#2]
Shawn is right.  It's one of the reasons why we buy, and prefer, Colts.  you don' t have issues with whether the chamber is mil-spec.