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.
Hi perf barrels and bolts
8 twist, 5R, Melonite, Wylde chamber
Last edited by Constructor; 07-26-2010 at 21:08..