I've got a Primary Arms 1x4 on a couple of my AR's. They have a set of crosshairs and a separate center red dot that can be turned on. It goes bright enough for full daylight use. The price is right on them (about $125) and they use a 30mm tube. If 4x would be enough for you, check them out. I run 1 - 1 1/2 power for close range with the red dot and power up to 4x for longer shots & use holdover. They also have a 1/4 moa dot in the center of the crosshairs to aid in very precise shooting - I like this for getting my 100 yard zero, using a 1" cold bore target. That makes the dot & the 1" target the same size - overlap the two black dots & hold steady.