How does the Micro work on a flattop AR-15 with a front sight tower?
I have never had an issue with the front sight tower, a 1/3 cowitness will keep the front sight in the lower bottom of the aimpoint and if you want an even lower placement of the front sight you could use the KAC night vision mount which keeps the front sight post even closer to the bottom. Since these are non maginfided optics the front sight is still visible in the aimpoint unlike the Elcan or other magnified optic
Here is a picture of the Micro on a KAC NV mount
Hope this helps