Not a red dot, but this is what I am using:
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Bushnell AR 223 1-4x, I found the cantilever mount to be too high, so have recently switched to lower rings.
Related question. Where is the best position to place the red dot, on the barrel mount or on the receiver. Ive seen guys mount them as far back as possible but with all the gasses/carbon from the blow back I would think it would get crud all over the objective lens after a few shots. Anyone with experience to weigh in?