I don't know if I'm missing something, or what, but it seemed to me the obvious solution would be an adjustable gas tube and something like the YHM flip up sight.
http://www.midwayusa.com/product/297...gas-tube-ar-15
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Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I suspect a thing or two... because I've seen a thing or two.
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