Hi all,

The flash hider on my M&P-15 Sport II is rotated several degrees such that the openings are lower on the right side than the left. Is this an issue? Shouldn’t it be aligned so that the flats are at 3 and 9 o’clock and that the slits on the flash hider are even?


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The slots at 3 and 9 O'clock should be flat. That flash suppressor is also designed to reduce muzzle rise some. with it canted, it will drive the muzzle to the opposite side the flash suppressor is canted.

Kind of surprised that nobody has jumped in to help you. I am not the expert here, but I think that when you twist on a muzzle brake or flash suppressor, you put on a crush washer prior to it. I think this helps keep the added unit from vibrating off. But, the amount or thickness of the crush washers sort of sets how far on you rotate the unit. Again, kind of shooting from the hip here, but you could take out one crush washer which would allow the suppressor to rotate a little further. If the is none there, you could add one or two to see if you get he alignment you want. It is a little bit trial and error and hard to judge if you have the right amount as you tighten the suppressor as it will crush the washers and go a little bit beyond where you think it is stopping. it has been many years, but I think I had to play with mine a couple times for good alignment. I just googled
"flash hider with crush washer" and came up with quite a few hits. I think if you do that you will get some good answers and advice. Good Luck!