Is this a lazer hologram like the Eotech or a conventional red dot like Aimpoint?
Not hologram like Eotech, but hs510c has better image quality and other advantages.
Here is a comparison review
Holosun Hs510c vs Eotech Complete Guide
As a gun enthusiast, you’ve probably seen the constant debate between Holosun Hs510c vs Eotech. While we think that both optics offer valuable results, there's something about...
lundestudio.com 
These are great actually. Quick release ones like this are great for the side of the AR or maybe a pig drive bolt/scout gun if you use that.
