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Hi David and welcome. I would seek accurate information from Ruger Customer Service at Telephone: 336-949-5200 / (Monday through Friday 8:00am - 5:00pm ET). Cheers and stay safe!

Hi David, the model in this review does have the Wilson/Nowlin ramped barrel, and according to the article, the 9mm also has the same barrel. The barrel is a Wilson/Nowlin type "bull" fully-ramped barrel that does not use a barrel bushing as with traditional 'Government" model 1911 pistols. https://guntoters.com/blog/2019/09/15/ruger-sr1911-model-number-6739-10mm-auto-product-review/ Stay safe & have a great day!