Highly recommended - Bushnell AR Optics TRS-26 Red Dot Sight

After having a difficult time using the objective optic on several high-end red dots, I purchased the TRS-26 and was pleasantly surprised. The 26mm objective allows me to have quicker sight acquisition and a better field of view on my AR. Because of my initial success, I also mounted a TRS-26 on my 300 blackout and a Keltec Sub2000. There's no shake awake, but the long battery life allows you to leave the red dot on all the time. Despite commentors saying you can't, you can set this red dot to stay on, on have it automatically time out.