Thread: Anyone running a 7in barrel on their ar15?
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Old 07-13-2010, 09:26 PM
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Spook Spook is offline
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Join Date: Aug 2005
Posts: 499
You have to wonder if an adjustable gas block with a "low" setting for supersonic and a "hi" setting for subsonic......

Kind of the opposite for what it is when you use one for the pistol position?
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