Welcome!
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Twist is either 1:12" or 1:9", early NEF/H&R ejector barrels were 1:12", later are 1:9", anything made 2005-2007 could be either, extractor barrels are most likely 1:9", other than that check the twist with a rod per the FAQs, there's a twist rate chart and build year list with that info.
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Tim