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The MBUS Pro sights are really nice, I really like them. Palmetto has them on sale as a set last I looked.
Only problem... they are designed for same plane mounting. Unless your gas block rail is the same height as your receiver rail, then they will not work together. You would need a different front sight or a riser to get the proper height with the front MBUS.
Do not use polymer sights on the gas block.
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