BUIS Question

[Sundowner]

I hope this isn't too dumb a question but are all AR-15 BUIS (e.g. - Troy, M.I., A.R.M.S., etc.) all the same height when flipped up. I'm asking because I'm wondering if changing the BUIS will give a different "co-witness" when looking through an Aimpoint (or other RDS) - i.e. - higher or lower. I know that the scope mount can be changed to adjust the co-witness but can just changing to a different BUIS accomplish the same thing? Thanks for any guidance you guys can give me here.

[Sundowner]

Anyone?

[joelogic]

For the most part all rears are the same. Fronts come in rail height or gas block height. But a couple of companies are making micros.

Basic answer, No.

You change the optic mount to change the cowitness height.

[ejhc11]

Just don't get the Micro Sights, most flip up sights are the std. A2 height. If you buy the matching Troy (not micro) you'll be fine. Also, if you have a gas rail block on the front and its not the same plane as your rear then you'll need to buy the front gas rail sight.

[Sundowner]

Thanks to you both for the information! Sorry to be late in responding but had to go out of town.