The standard mount that comes with the Comp M4 is a true co-witness mount. If you want a lower 1/3rd co-witness you need to get a spacer or go with a Larue or ADM mount. DSG arms has good package deals, as does Larue and GandR Tactical. As far as the front sight being in the way, it is not an issue, but I prefer the lower 1/3 co-witness. I run a comp M4s with an ADM mount and love it. The Comp M4 is light years better than your other optic choice.
"You have never lived until you have almost died. For those who fight for it, life has a flavor the protected will never know." - Written by an unknown soldier in Vietnam.
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