ADCO SOLO Solo 1x 33mm 3 or 10 MOA Multi-Reticle CR2032 Lithium Black

Adco's Solo red dot is ideal for your AR15 platform. It utilizes four reticles: 3 MOA dot, a 10 MOA dot, a bracketed dot and a T-dot to present that can be changed at any time without need to rezero was a great aid to them. You can change the presentation from red to green in varied brightnesses.