Dead Air DA135 Xeno Xero Black 4140 HT Alloy Steel 9/16x24 RH Threads 1.105" OAL 0.99" Diameter 9mmThe Xeno Xero threaded taper mount is a muzzle device that gives a lightweight minimalist mounting option offering non negotiable repeatability and a solid return to zero. All this while still delivering the durability youve 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. All