I owned one of the bushnell ar/223 optics and for the money was a decent piece. Any of the Burris 1-4x I've owned and I've owned all of them(tac30, MTAC,XTR) where very high quality. The only one the bunch I didn't like was the leupold, not for it's lack of quality in the glass department but I found not having a true 1x on a dedicated AR type optic a big minus. Honestly at those ranges any of the 1-4x will work for you. Vortex, Burris, Bushnell, and even consider brands like Millett and the very nice offering from Hi Lux(CMR).