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DETAILS GEMTECH’s new GM-45 suppressor utilizes our patented G-Core technology. The G-Core design is exceptionally user friendly and allows the user to clean the entire unit. The GM-45 is shipped with the standard .578-28 piston with other several options available. FEATURES Wet Sound Reduction: 32-35 dB Sound Reduction: 21-23 dB Caliber Rating: 45ACP, 9mm, 10mm (dry only), 40S&W (dry only) Full Auto Rated Length: 6.2? (without mount) Diameter: 1.375? Weight: 5.5 oz. (without mount) Material: 7075 Aluminum Tube Finish: Matte Black Cerakote with Reduced Visual-IR Signature Core Finish: Matte Black Anodize Mount: All GM-45 suppressors are shipped with a .578-28 standard piston