Thread: 5.56 NATO vs .223 Remington
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Old 08-03-2009, 02:01 AM
Yournamehere Yournamehere is offline
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Join Date: Nov 2008
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Essentially yes, but it's standard on certain AR-15A2s. Bushmaster makes one too for building on.

Here's an example.

http://v4.beta.gunbroker.com/Auction...=135798245#PIC
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