Does anybody know how many rail slots the front sight will use?

It looks like 2? Or 2.5? I'm trying to figure out because my M&P15 OR has a two slot railed gas block and want something that fits on that without hanging over...

It looks like 2? Or 2.5? I'm trying to figure out because my M&P15 OR has a two slot railed gas block and want something that fits on that without hanging over...


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