There is not a lower mount for the OpticsPlanet Exclusive Burris AR-332 3x32mm Ballistic CQ Reticle Prismatic Red Dot Sight.
Actually, the Burris AR 536, and the 332 both use ACOG compatible mounts. I use American Defense mounts, just for the sake of quick detach levers, and have had extremely good results. I own multiples, and they all wear the American Defense cantilever ACOG mounts, to clear back up sights , and provide ease in getting proper eye relief.