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Old 11-14-2012, 22:20   #1
Robreynolds
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Magpul MBUS for M&P15 OR?

Every thread that mentions the MBUS sights say not to put them on a gas block. I like the MBUS sights and I am wondering how much shooting I would have to do before I have to worry about that much heat. Also since I am wanting this for the M&P15 OR, would the sights be level as far as the gas block and the rail being the same height?
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Old 11-14-2012, 22:23   #2
mjkeat
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Do it then let us know how it goes.
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Old 11-14-2012, 22:32   #3
WoodenPlank
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If I remember right, the M&P OR has a same-plane gas block.

Not sure how much heat it would take to cook an MBUS front sight, but even Magpul says not to use them on a railed gas block.
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Old 11-14-2012, 22:34   #4
Cole125
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Don't do it. Buy Troy BUIS, and be done with it.
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Old 11-14-2012, 23:46   #5
Made in Austria
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I was in the same boat. Till I decided to mount Troys on mine. To put a plastic sight on a gas block is just not right and is a monkey business. Troys are a little pricy but well worth the money. They are very robust and well made. I promise you, you will love the troys on your rifle. The magpul sights are excellent, but not on a gas block.

Last edited by Made in Austria; 11-14-2012 at 23:46..
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Old 11-15-2012, 00:02   #6
bigmoney890
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Daniel Defense fixed front sights are only about $20 more and are gas block safe.

http://www.skdtac.com/Daniel-Defense...-p/ddf.123.htm


I'd go with this or one of the above mention metal sights, unless you absolutely have to have a folding polymer sight.
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Old 11-15-2012, 07:11   #7
cowboy1964
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I have the DD on my M&P OR. It works but looks cheesy because it overhangs front or back of the block.

Last edited by cowboy1964; 11-15-2012 at 07:11..
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Old 11-15-2012, 10:17   #8
plouffedaddy
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There's a good thread/test over on TFL by Metal God where he tested this; a quick search should turn it up.

Quick summary of the findings--eventually they'll melt but it does take a bit of shooting to make tit happen.

FWIW, I put MI metal sights on my gas block to avoid this...
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Old 11-15-2012, 10:47   #9
Matthew Courtney
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Yankee Hill flip up front sight $65.

http://www.midwayusa.com/product/210...aluminum-matte
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