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Old July 14, 2012, 02:54 PM   #4
Creeper
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Join Date: September 9, 2008
Location: Woooooshington
Posts: 1,797
I'm guessing he's getting a low-pro gas block and mounting a MBUS type front sight on the hand guard rail... above and a few inches ahead of the gas block. Not a tremendous amount, but it may make a small difference in quality of sight alignment.
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