^^^The MBUS is the wrong height for the gas block as well. They are meant to be mounted on forends only. Midwest Industries makes a nice affordable flip-up front sight for railed gas blocks, as do several other brands. I just mentioned them since the MBUS seems like and attempt to cut down on the cost (which is totally understandable).
Just trying to be helpful, not critical.
Just trying to be helpful, not critical.
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