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gas block picatiny rail

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Why would DPMS make the front rail lower than the mail rail?  I just bought some railed handguards that are carbine length and not free floating......just to replace the glaciers and allow a bipod.

They run on the same level as the main scope rail and it pointed out immediately that the gas block rail is lower.


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^^^ Like Robo pointed out...  Those guys he listed make gas blocks that will line up with the rail height.  No special-height front sights necessary (but do not use a MagPul polymer sight on any gas block attachment...). 

The initial, early gas blocks with Pic rails were lower, and do require a special-height front sight.  Definitely something that you have to pay attention to when you're shopping for front sights.  "Standard" would be a good product description for a sight to mount on a free float rail, or one of the gas blocks that Robo mentioned.  Front sights for a lower-than-rail-height gas blocks will definitely have that in their product description. 

Here's an example, from Midwest Industries:



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