Mainly because i has a gas block and a M.O.E. handguard. My OP was a question asking if it could be done. From the picture I posted it clearly can be done. That is the reason that picture was posted.
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Is this thread a joke?
This is a great day in internet history!
If you don't have anything helpful to say, please keep you useless comments to yourself.. thanks have a blessed day :)
Thanks to those that posted useful info. I have the M.O.E. on my rifle, an it went on without a problem.
They work on my M&P OR
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It can be done I suppose.
The question is, why?
And why the switch?
How are you going to run iron sights?
You do know that your gas block is very likely to be at a different height than your upper receiver?
Are there any reputable manufacturers that make a BUIS for gas blocks?
I'm not aware, though I was never in the market for one.
Why not run a simple, inexpensive tube like the Troy Alpha over a low profile gas block?
Advantages are you can choose the length of the sight radius, lightweight, and free floated.