The Omega 9K is a lightweight and compact suppressor with impressive sound reduction. The simple yet robust tubeless construction makes it an attractive pistol suppressor for a wide range of shooters. Full auto rated and ideal for use with pistols and submachine guns, the Omega K Series offer extreme durability and performance in a compact package. The Omega 9K suppresses 9mm, and can suppress subsonic and supersonic .300 BLK. Ships with Alpha Direct Thread Mount 5/8 X 24, Piston Spring & Retainer Cap, and a 3-Lug Tool. Caliber Compatibility: 9MM to .45 ACP including .300 BLK Total Length: 4.54" Weight: 7.3 oz Diameter: 1.48 Muzzle Average: 9MM: 135.8 dB, 300 BLK Sub: 133.7 dB Materials: Cobalt-6 & 17-4SS Finish: Black