The KAC micro 600m rear, and micro front are easily my favorite irons for any AR, but esp. on a high end precision AR where I can afford the extra cheese for them.
First and foremost, they are very reliable, and hold zero....and are very good out to indeed 600m (big plus for a MWS)
Secondly, they are incredibly small/light....and will fit under just about any modern AR mag. optic mount setup...ie. larue,adm, bobro mounts will clear easily with the nxs compacts, and the 3.5s.
Thirdly, KAC makes them, and if something goes wrong....no questions asked...they fix it. I can attest to this firsthand on a front micro that didn't have a strong engagement when up.
Other good options that I personally have time on..
Troy front and rear.
Magpul MBus....but specifically the new ones that ripped the KAC micros off. The org. MBus won't fit under many glass setups.
Old non micro KAC irons...numerous models, all are good for your application except the 300m rear models.
Hope that helps