I did the same thing, took the MBUS sights, (that came with ACR) and put them on my SW15-22. Im using the troy battlesights on my ACR and they have worked out perfectly. I like the HK style as well, the extra ring up front give you another aiming point for more precision. As far as height, when they are folded the lay lower then MBUS. When they are up, the aiming plane is the same as the M4 (height over rail). So with non riser eotech, it will give you and absolute co-witness. Eotechs with riser, lower 1/3.Losman I agree on the mbus sights...they are junk! I will need to invest in some Troy Battlesights myself. I have the MBUS on my S&W M&P 15-22 MOE and I think they are fair at best. I will have an eotech on my ACR so the iron are secondary. What sights are you looking at and do your Prefer the A2 or HK Style? I personally like the HK style. But one concern, how is the height on the Battlesights compared to the MBUS...MBUS dont look to be as tall.
Cant wait to hear more!!!