Fans of the new Zermatt Arms RimX rimfire actions will be an even bigger fan of the PROOF Research prefit carbon fiber barrels designed for the RimX action. PROOF's RimX prefit barrels will arrive threaded and chambered. This is a shouldered barrel that requires few specialized tools for install. They're offered with a variety of lengths and contours in both stainless steel and carbon fiber.
* These PROOF Research/Zermatt Arms RimX prefit barrels are pre-headspaced.