SuperSetCa, the man the myth the youtube mogul has produced an excellent review on the Holosun HS503G Red Dot ACSS a couple months back. If you aren’t familiar with SuperSetCa he is a 3-gunning guru with a penchant for reviewing optics fully. Besides having a particular proclivity to reviewing optics he happens to be a magician with a camera. What you get are well thought out and produced videos that tell you what you need to know in a short time frame.
Holosun is a company known for making quality optics for those on a budget. The Holosun HS503 has the body of the aimpoint micro, with the outer circle reticle of an EOtech with a inner bullet drop reticle. The outer circle reticle can be turned off it is so suits you. With so many companies doing the same thing it’s a fresh approach to red dot optics. The Holosun HS503 sports a 50k hour battery life with an 8 hour shutoff feature. The dot has been reported to be extremely bright and crisp. Another attractive feature is the price. With so many optics sitting at 400 plus dollars the Holosun feels like a relief coming in at around half that at 219 dollars.
I've been running one of these on an AR for almost a year now. The optic itself is good - it's no Aimpoint or Trijicon, but it has held up well through 3 gun and general not gentle (but by no means Infantry rough) use - the battery is still going strong. The important thing here though is the little circle dot reticle - combined with a magnifier, it basically becomes an ACOG - flipped to the side, it's an EOTech. That is an awesome setup and I'd love to see this red dot ACSS reticle put into an MRO or T1 one of these days.