Just an FYI; I was in a Travis Haley D5 Carbine course a couple of weekends ago and Travis was running a Romeo 4M (made by Holosun) on a Scalarworks mount. I asked him about it and he said they beat the shit out them in classes and haven't had any issues. He also mentioned the Holosuns have done well. From what I can tell, the Romeo 4M appears to be the same as the Holosun 503GU, though I could be mistaken. I run one on my VEPR AK and decided to get a 503GU for my primary AR, since my EOTech XPS2-2 decided to blink on me during one of the drills.
Pic of Haley's carbine:
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