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SBR Dilemma (.223 or .300 Blk)
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November 13, 2011, 11:18 AM
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RAnb
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Join Date: July 20, 2008
Location: WA, USA
Posts: 447
I would start with the BLK as it is made to cycle the AR action with sub or super sonic ammo. I have uppers for 223 and 300 whisper.
Ranb
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