Due to popularity of our beloved legacy product the CHECKMATE-QD suppressor we present to you the CHECKMATE-HD suppressor. This new CHECKMATE-HD is a 5.8 ounce 5.7x28 pistol rated rimfire suppressor and utilizes our patented ECO-FLOW baffle technology as well as our newly developed CARBON-GARD technology- the subject of a pending patent. The 5.8 ounce 5.04 overall length suppressor features a 17- 4 heat treated ECO-FLOW baffle system front cap and integrated EZ-LOK QD mounting system. The tube is 7075-T6 billet machined and hardcoat anodized for maximum strength. The CHECKMATE-HD is the new market leader in rimfire suppressors. - The CARBON-GARD technology seals the entire baffle core with high temperature Silicone O-rings. This allows the suppressor to be more user maintenance friendly than any other rimfire suppressor on the market. After 2000 rounds are fired the inside diameter of the tube and outside diameter of the core are still spotlessly clean for ease of disassembly without specialized tools other than a US quarter. - Extensive workup was done to the baffle system resulting in a baffle system with zero first round pop and a market leading sound pressure level (SPL) on rifles and pistols. - The CHECKMATE-HD comes with an EZ-LOK 1/2x28 barrel adapter and is field ready out of the box. The only supporting accessory outside of various threaded barrel end couplers is a CAM-LOK