The same plane sights are made to mount on a rail or gas block the same height as the receiver, all rear sights should be the same height.
If you plan to mount a front sight on a lower gas block then you need to buy the taller front sight.
The 6.8 is the fastest growing cartridge and #1 choice for hunting deer and hogs with an AR15.
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Last edited by Constructor; 07-26-2010 at 21:08..