Thompson/Center constantly strives to improve the performance and accuracy of our firearms. One major factor that we studied is the different rifling options developed in the past and how they perform with our rifles. In this study, we found that 5R rifling had the characteristics, consistency and improved accuracy that we were searching for.
5R rifling is a rifling developed in Russia which uses 5 lands and 5 grooves instead of the traditional 6 lands and grooves. In addition, the sides of each land are cut at a 65 degree angle versus a harsh 90 degree angle on standard rifling (see graphic below).
Benefits of 5R: 5R rifling’s unique design provides benefits to the shooter by causing less bullet deformation. How? Because the edges of each land do not cut into and deform the bullet jacket. When the bullet jacket is less deformed, there will be less jacket fouling in the grooves. The results are better consistency of accuracy from shot to shot, greater bullet stability over multiple shots, and ultimately a rifle that’s easier to clean thoroughly.
T/C’s confidence in 5R rifling and it’s dramatic improvements in consistency allow us to MOA Certify each ICON rifle before it leaves the factory and provide that target in the box with the gun. When you see the 5R logo stamped on our T/C Venture you can rest assured that MOA is guaranteed.