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Hi John and welcome. This model has a Twist Rate of 1:8" inches. Upgraded 5R rifling - 5R reduces projectile deformation as it passes through the bore during the firing sequence. By placing the lands opposite of the grooves, the bullets are no longer squeezed on opposite sides ensuring the projectile stays uniform instead of squeezing material into the grooves. Cheers and stay safe!

Hi John, the twist rate is 1:8 - What is 5R Rifling? 5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. Conventional rifling, while effective, can be improved upon in two ways. 1. Conventional rifling has sharp 90-degree corners from the top of the land to the bottom of the groove. 2.Conventional rifling has lands and grooves opposing one another. 5R rifling improves upon this by using 5 lands and grooves over the even numbers which puts lands opposite of grooves. Further, the transition from the top of the land to the groove is sloped. . Read full article here >>> https://faxonfirearms.com/blog/what-and-why-5r-rifling/ . Stay safe & have a great day!