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This is the only info on a Iver Johnson 1911 barrel I could find. Description 1911 45acp 5″ barrel Fits Government size 1911 Deluxe semi-gloss blued finish Original GI part number engraved on the barrel hood under the caliber 28-34 Rockwell hardness Made of 4140 steel 1:16″ left handed twist 6 lands and grooves Does not include a link or pin Certified gunsmith fitting is required

Hi David and welcome. Iver Johnson Customer Service can answer this accurately at 321-636-3377 or email inquiry at service@iverjohnsonarms.com. Cheers and stay safe!

Hi David, I would contact Iver Johnson with your specific model for an accurate answer. Email service@iverjohnsonarms.com