56x45mm rounds. These rifles are developed on our patent pending “Multi-Caliber” selector switch engineering which allows end users to easily transform amongst calibers without any tools or modification by simply depressing a small lever about the left side on the receiver to remove a pin and rotating out the selector https://jonathant470ira4.snack-blog.com/18204554/not-known-details-about-noveske-rifles-for-sale