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AR15.COM
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11/12/2014 10:21:13 AM EDT
Good morning, and thanks for reading.

I have a Smith and Wesson M&P 10 that I just added a *cough cough* Troy rail too, and I slapped on a set of BUIS Troys.  I decided on a 38 yd zero based on my load, and i'm coming up VERY low.  I have the sight cranked all the way down and i'm still over 2" low at 38yd.  I've confirmed this at range and it's definitely low.  The sights are correct height (not GB), the rail is the correct height (DPMS high).  Thoughts?  I hate to file down the front post, but I'm guessing that's my only option.

I've also tried a second set of BUIS (magpul pro's) and had the same results.

Thanks in advance!
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