Without the use of tools, you can instantly reconfigure the Ti-RANT 45M from a full sized 9-inch silencer into a 6.9-inch compact model, meaning the best selling silencer for 45 Auto, 44 Mag, and 9mm Luger hosts is now even more versatile. With an additional 5/8 x 24 adapter (sold separately) enables users to employ their Ti-RANT 45M on semi-automatic rifles, carbines, and pistols chambered in 300 BLK for firing subsonic ammunition. 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