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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