Just added a set of Troy folding battle sights to my rifle.

I got the M4 style front and the di optic aperture (diamond shaped large aperture and "pinch pointer" long distance) and think they are really well made and seem very high precision.

I'll bore sight them in initially and adjust from there conventionally at the range. Right now they are exactly co witnessing my cheap red dot. I say cheap but it has proved pretty good so far, just not as bright in bright, daylight as I'd like and I may replace it with EOtech or the like after the holidays.

Anyway, love the Troys and highly recommend Primary arms that had them to me in two days flat. Good prices and great service.

Nice, I just got a set of Troy BUIS for my M&P15 as well. I went with the M4 style front and the DOA rear. I like the diamond shaped rear aperture. Top quality gear. Glad I did not get the polymer magpuls(MBUS), especially the front. During shooting the other day my front sight(mounted on the gas block on my OR) was so hot I had to put gloves on just to flip it down.
Did it take much adjusting to zero in your BUIS?

I haven't had the chance to get to the range yet but initially I will bore sight at 50 yards and then test groups to fine tune.