The new GM-22 comes from over two decades of silencer innovation and research. The unique G-Core design enables the user to easily maintain their silencer while still providing the best noise reduction in the industry. – Sound Reduction: 36-39 dB – Caliber: 22LR 22WMR 17HMR (not rated for 17WSM) – Full Auto Rated (for 22LR only) – Length: 5 – Diameter: 1 – Weight: 2.5 oz. – Material: 7075 Aluminum – Tube Finish: Matte Black Cerakote with Reduced Visual-IR Signature – Core Finish: C3 Technology – Mount: 1/2-28 Ti Thread Insert