While optics aren't legal in IDPA now, because of fears of an arms race, I do think optics will eventually become common on self defense guns. Not that long ago (mid-80s), the auto was considered unsuitable for self defense by most people/trainers except for Gunsite devotees. Now autos are the rule rather than the exception. A technology change (Glock as the lead example) brought about the change. The next generation of small optics could do the same thing. From a marksmanship perspective, there's no comparison between iron and optic; the only issue is durability and reliability. The size issue has been solved already.
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