The Xeno Xero threaded taper mount is a muzzle device that gives you a lightweight minimalist mounting option offering non-negotiable repeatability and a solid return to zero. All this while still delivering the durability you've come to expect from a Dead Air mount. The shorter size decreases its entrance into the blast chamber maximizing sound performance and minimizing overall weight. The Xeno Xero is compatible with all Dead Air Xeno Adapters. The 1/2-28 Xeno Xero has a bore size to fit 9mm and smaller projectiles. The 5/8-24 Xeno Xero has a bore size to fit .46 and smaller diameter projectiles. - All of the features from the large taper the left-hand threads to the accessible tool features provide the optimal platform for precision shooting while still being capable of hard use. The Xeno system takes a simple design and maximizes all the variables in the shooter's favor.