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AR15.COM
11/28/2009 12:56:06 AM EDT
is there a mount made for a flat top upper that utilizes a FSB rather than a flip up front sight. Looking at an inch tube
11/28/2009 1:13:40 AM EDT
[#1]
You can use a scope with a FSB so long as the ring height is 1.4"

The LaRue LT-104, LT-139 fit the bill.  The FSB will still be visible at low power but will be little more than a blur at higher power.