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AR15.COM
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11/2/2015 9:50:02 PM EDT
Hey guys I have a BCM complete upper this one and am looking at putting a low profile gas block on it so I can have complete flip up sights.

Anyone know the size of the gas block for this? I dont have anything with me right now to measure and Im in a hotel. Thanks!
11/2/2015 10:04:13 PM EDT
[#1]
Just cut down your FSB.
11/2/2015 10:06:52 PM EDT
[#2]
why waste a perfectly good front sight that could be used on another rifle?
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