The Obsidian9 is optimized for 9mm for additional suppression while staying light and compact. The Rugged ADAPT(TM) Module gives you 2 lengths in one suppressor, for maximum suppression or weight/length savings. With a diameter of 1.37? the Obsidian9 is compatible with pistol suppressor sights, making it perfect for pistols or sub-guns. Key Features CALIBER: Full Auto Rated for Pistol Calibers up-to 9mm, 300BLK Subsonic (with an 8? barrel) , 9x39 subsonic (with an 8? barrel) and 350 Legend (with a 16? barrel or longer). DIAMETER: 1.37? LENGTH: Standard Configuration: 7.8?, Short Configuration: 4.85? WEIGHT: Standard Configuration: 12.7oz; Short Configuration: 8.7oz FINISH: Hard Coat Anodized MATERIALS: Baffles: 17-4 Stainless Steel. Tube: Hard Coat Anodized Aluminum. Mount: 17-4 Stainless Steel Finish: High Temp Cerakote(R) (over the entire suppressor) WARRANTY: Unconditional lifetime warranty from Rugged Suppressors INCLUDES: Direct thread mount, 9mm Front Cap, Obsidian9 Suppressor, ADAPT Module, Operator's Manual and Obsidian Logo Sticker MPN: OBS0009 All NFA rules apply. Please contact us if you are unsure about purchasing a suppressor.