Sorry, in this case I’m referring to no magnification. Your right that’s there’s a bunch of things that could be sights without it being irons.
The photos and media speculation seem to suggest that there wasn’t a scope.
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I still don’t think this is as easy as people make it out to be. Yes, a novice could put a tight grouping downrange - but could they do that on their first shot, on a hot metal roof, with adrenaline pumping.
I know it typically takes me a few rounds at the range to get dialed in.