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Have yet to try it out but for mine I grabbed a holosun hs503g with ACSS reticle. Apparently the horseshoe is approx spread of buckshot at 25 yards and has bdc reticle for slugs at 25-150 yards.
Trijicon SRO 2.5 moa on a scalarworks mount, mine's wrapped in a Jagerwerks bros shield, raises the dot another millimeter or 2. I also have a 1/4" god-a-grip cheekpad for proper eye alignment. Red dot's at the perfect height, still can use the iron sights underneath but just barely.
I'm running a Holosun HE508T-GR-X2 on my M4, sighted at 50 its a tack driver with rifled slugs. You can switch between 3 reticles on the optic (outer ring & dot which is what I use / just the centre dot / just the outer ring)
I just checked and you're right! T.O. and RDSC both had them in stock! I had been looking for one for a friend of mine years ago after he saw mine and nobody had one. Excellent! I'll let him know!
I have a T1 Micro (4moa) with an ADM quick release mount. It's a nice optic and fits the M4 very well. Easy enough to take it off if need be with the QR mount.