The SilencerCo Osprey is the lightest, quietest, and only multicaliber polygonal centerfire pistol silencer on the market. Monocore baffle design in a polygonal package allows for greater internal volume and top tier suppression. Patented push button system for simplified use. Works with most factory sights. Caliber: 9MM and 300 BLK Subsonic. Length 7.06 inches, Weight 9.8 oz, Aluminum and Stainless Steel construction. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor