The Omega 9K like the full-size Omega from which it draws its name is an exceptionally versatile silencer and is the smallest lightest and quietest silencer of its kind in the world at just under 5. Full auto rated and usable with pistols rifles and submachine guns the Omega 9K offers extreme durability in an ultra-compact package and is compatible with 9mm and 300BLK. With the fully-welded tubeless minimalist Omega 9K big sound suppression now comes in a tiny footprint. - Calibers: 9mm to .300 BLK - Muzzle Average: 9mm: 131.5 dB; .300 BLK: 133.7 dB - Finish: Black Oxide - Weight: 8.8 oz (with Direct Thread Mount) - Diameter 1.475 - Length: 4.7