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AR15/M16 Pencil Barrel Drift at 300m: how bad?

In which Bloke takes his 9 million series real Colt M16A1 (not an AR15, or a build kit or a repro) at 300m with a Brownells Retro 4x carry handle scope and puts 30 reasonably quick rounds through the barrel to see if there’s any worrying drift due to imperfect stress relief in the barrel. What happens with this particular pencil barrel?

Kind of a supplement to this @InRangeTV video: />

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