This new robust silencer from AAC is engineered for the toughest usage and conditions. With a serviceable front end cap full-auto compatibility and an included 1.375-24 mount the versatile Ranger Series is focused on reliable performance. Removable front end cap Oversized baffles and end cap to 6mm Full auto ratedSpecifications: CALIBERS: 5.56mm WEIGHT: 15.2oz LENGTH: 5.825 DIAMETER: 1.5" MATERIALS: 718 Inconel and 17-4 H900 Stainless Steel FINISH: High Temp Cerakote ATTACHMENT: 1.375-24 Universal Mount REDUCTION: 32dB S.P.L.: 132dB