P223 3X here on a flat top carbine w/16" medium heavy barrel, in Nikon P mounts/rings. Left the A2 front sight on, doesn't cause a problem.

Still can't hunt with an AR here, so no need for more power. Eyes finally got too feeble for the peep sight that was on the critter, so went with the 3X Nikon.

If three or more people think you're a dimwit, chances are at least one of them is right.