Dead Air Xeno Xero Mount for .45 caliber with 11/16-24 threads. The Xeno Xero threaded taper mount is a lightweight, minimalist muzzle device designed for repeatable accuracy and solid return to zero. It delivers the durability you expect from Dead Air mounts. The shorter length minimizes entrance into the blast chamber, maximizing sound performance and reducing weight. The Xeno Xero is compatible with all Dead Air Xeno Adapters. Thread sizes supported include 1/2-28 and 9/16-24 Xeno Xero bore options.