Obsidian9 SpecificationsDiameter: 1.37a ^2Length: Standard Configuration: 7.8a ^2 Short Configuration: 4.85a ^2Weight: Standard Configuration: 12.7oz; Short Configuration: 8.7ozBelt Fed Rated for Pistol Calibers up-to 9mm Luger300BLK Subsonic (with an 8a ^2 barrel)9A-39 Subsonic (with an 8a ^2 or longer barrel)350 Legend (with a 16a ^2 barrel or longer)MaterialsBaffles: 17-4 Stainless SteelTube: Hard Coat Anodized AluminumMount: 17-4 Stainless SteelFinish: High Temp Cerakote (Black)Additional FeaturesRemovable Front CapsPistons work as a Front Cap ToolIncludes1/2A-28 piston9mm Front CapObsidian 9 SuppressorADAPT ModuleOperator's ManualObsidian Logo Sticker