Pulled out the AR today on which I mounted the vortex spitfire 1x to re-zero it for a lighter varmint load, and it was immediately obvious that the mount is actually two pieces. Unsure how I overlooked before. Regardless, opened and read the manual this time too -- and the standard setup is lower 1/3rd cowitness on ARs is 40.4mm from center optic to base surface. The lower mount is ~1 cm/~10mm lower and puts it at 30mm from center to base.
The ocular lens is around 34mm and larger than objective lens, which puts the low base height, excluding optic, at about 13mm or 1/2 inch. This video from sootch (also clearly didn't watch until now) shows both mounts:
https://www.youtube.com/watch?v=Q84jsw_O1j8I'd say low base on this is 2-2.5 times wider/taller than what's found on microdots... Believe all other comments regard spitfire on are on point, but wanted to clarify height.
Do note that they previewed V2 of the spitfire 1x at shotshow this year with illumination controls on rear face as buttons instead of top turret (more like sparcs controls I suppose) and will be powered by aaa battery instead of cr battery. Also, this verison, the mount does appear to be fixed due to controls. Possibly why PSA was clearing out the originals at less than 1/2 msrp.
http://www.vortexoptics.com/product/vortex-spitfire-ar-1x-prism-scope