That’s what quick release mounts are for. I like the idea of offset BUIS, especially for say a long gun with a scope that can’t co-witness and whose other option is say mounting above the optic. Having said that, offsets require training to get use to as it is awkward and not a natural motion/shooting position and don’t offer much of a cheek weld as compared to traditionally mounted irons. My Eotech or Elcan breaks and interfere with co-witness, I can pop off the optic in seconds and operate my gun with the irons in the same manner I’ve done for years...
For me, co-witness irons and spend a little extra for quick release mounts for your optics.
I disagree. If you are in a gunfight, there is no time to remove optics. Transition to offset sights is quick and easy to learn. Plus QD mounts are rarely quick to disconnect , especially under stress
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