DURA-bility & Heavy Duty use. The DURA HD series are built for those who prefer products built for the long haul and are engineered to take a beating. Lasting like an engine with 400K miles or a watch handed down through the generations, the DURA HD delivers maximum performance over the long haul. Material selection is geared towards DURA-bility. A pleasing tone, even on supersonic bullets, is achieved through advanced material and baffle design. Rhino Shell coating protect your can’s exterior and Super Slick99 coating keeps the suppressor from gaining weight from carbon buildup.