So I have been running a Holosun HS510C on my primary AR-15 pistol (10.5" Aero Precision) and on my primary AR-15 Rifle (14.5" Aero Precision / Troy Ind) for over a year now and decided to write up a very short and sweet $0.02 review. Over the years I have used everything from Aimpoint to Eotech and a host of mid-range options from Vortex, Sig, Holosun, and Primary Arms. My agency runs the Sig Romeo4T and the Sig Romeo4M, as does the FBI, and both are excellent red dots. But the HS510C seems destined to go down as my favorite 1x optic. The battery life is extremely long, it features the solar panel systems that extends the batteries even further, it is very rugged and well made, and the field of view is impressive. It comes with a QD mount that has been tight and reliable, and holds zero no matter how many times I take it off and put it back on. But perhaps one of the best things about this optic is the fact that the 65MOA + 2MOA circle dot is so crisp that does not get my astigmatism all worked up into a blur like other sights do. Everything about this 510C makes me think of Eotech but the Holosun us better in almost every way. The Holosun is smaller, lighter, less expensive, has better glass, a better emitter, better reticle, a solar panel, and just as good of mount. The Eotech has more history and is surely more durable in extreme conditions. Not that the HS510 isn't durable. I have banged mine around quite a bit with no issues and observed some pretty impressive torture tests where it came out just find. I took it out in the cold and snow last winter and tossed it around, shot some rounds, tossed it around more, etc. and never had a single problem. Holosun has recently produced the HS512C, which is an enclosed version of the HS510C. But this comes with a higher price tag. But that also means the price of the HS510C is going to continue coming down. As much as I spend on guns, ammo, and accessories I am still a cheap skate. I paid $329 each for mine in 2018, but recently picked up two more from AIM Surplus for $229 each (on 4th of July sale). But AIM has them for $259 normal price which is less than the standard $299 I see them selling for at most places. I am hoping AIM has another sale over Labor Day, in which case I will be buying two more. Not that I need more as I currently have a Sig Romeo4T and two Sig Romeo4M's still new in the box sitting on my parts shelf. But when I like something, I like it. I want to have one sitting there for my next build and I want a back up if something goes wrong. And that alone is a pretty solid testament in favor of the HS510C.