Obsidian45 SpecificationsDiameter: 1.37a ^2Length: Standard Configuration: 8.6a ^2 Short Configuration: 6.7a ^2Weight: Standard Configuration: 12.8oz; Short Configuration: 10.7ozBelt Fed Rated for Pistol Calibers up-to 45ACP300BLK Subsonic (with an 8a ^2 barrel)350 Legend (with a 16a ^2 barrel or longer)450 Bushmaster (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 Caps9mm Front Caps availablePistons work as a Front Cap ToolIncludes.578A-28 piston45ACP Front CapObsidian45 SuppressorADAPT ModuleOperator's ManualObsidian Logo Sticker