Very few BUIS will fit under a scope in an Armalite mount.
Here's how to figure it out:
Measure your eyepiece diameter with any flip caps and divide that by 2.
Subtract that from the centerline of the scope mount.
This gives the highest BUIS that will fit under your scope and mount.
Using the DMS-1 as an example:
Eyepiece with flip cap diameter is 1.8". Half of that is 0.9". The Armalite centerline is 1.25", and subtracting 0.9 from that leaves 0.35" clearance. The only BUIS I know of that will fit is the KAC 300M sight.
Here are some popular BUIS heights:
ARMS 40 - 0.950" folded (mine is 1.00" even)
YHM-9680 - 0.840" folded (mine is 0.850")
Matech - 0.75" folded
MI ERS - 0.750" folded
GG&G MAD - 0.625" folded
ARMS 40L - 0.610" folded
Troy - 0.460" folded
MI MCTAR-SPLP - .4375" folded
KAC 300m - 0.315" folded
and here's the Big List of AR15 one-piece mounts:
www.maxicon.com/guns/optics/one_piece/ar15_onepiece_mounts.htm